Sale 1:

https://backpack.tf/profiles/76561198335791307#!/compare/1569110400/1569196800

https://backpack.tf/profiles/76561198072494410#!/compare/1569196800/1569542400

Sold for 6 keys

Sale 2:

https://backpack.tf/profiles/76561198326074055#!/compare/1569283200/1569456000

https://backpack.tf/profiles/76561198275484308#!/compare/1569369600/1569456000

https://backpack.tf/profiles/76561198132684836#!/compare/1569196800/1569369600

Not unusual then SCM

sale 3:

https://backpack.tf/profiles/76561198132684836#!/compare/1570665600/1570752000

https://backpack.tf/profiles/76561198841279602#!/compare/1570665600/1570752000

QS

sale 4:

https://backpack.tf/item/5010984131

https://backpack.tf/profiles/76561198043974838#!/compare/1569715200/1569888000

Not unusual til this point

Sale 5:

https://backpack.tf/profiles/76561198043974838#!/compare/1570060800/1570579200

https://backpack.tf/profiles/76561198079841650#!/compare/1570406400/1570492800

Untrace

sale 6:

https://backpack.tf/profiles/76561198079841650#!/compare/1570492800/1570579200

https://backpack.tf/profiles/76561198305676157#!/compare/1570492800/1570579200

QS

sale 7:

https://backpack.tf/profiles/76561198305676157#!/compare/1570924800/1571011200

https://backpack.tf/profiles/76561198407129701#!/compare/1571011200/1571443200

Sol for 5 keys

Sale 8:

https://backpack.tf/profiles/76561198141838074#!/compare/1565913600/1571443200

https://backpack.tf/profiles/76561198135935874#!/compare/1569801600/1569888000

Bulk QS

sale 9:

https://backpack.tf/profiles/76561198042293805#!/compare/1571184000/1571270400

https://backpack.tf/profiles/76561198134400928#!/compare/1571184000/1571270400

Bulk

sale 10:

https://backpack.tf/profiles/76561198134400928#!/compare/1571270400/1571788800

https://backpack.tf/profiles/76561198325041899#!/compare/1570752000/1571270400

Sold for ~4 keys (QS)

Sale 11:

https://backpack.tf/profiles/76561198325041899#!/compare/1572220800/1572307200

https://backpack.tf/profiles/76561198210598009#!/compare/1572307200/1572393600

Sold for 6 keys

Sale 12:

https://backpack.tf/profiles/76561198210598009#!/compare/1572307200/1572393600

https://backpack.tf/profiles/76561198454615761#!/compare/1572307200/1572393600

QS

Sale 13:

https://backpack.tf/profiles/76561198184729671#!/compare/1565827200/1569110400

https://backpack.tf/profiles/76561198062449384#!/compare/1566086400/1569456000

SCM

Sale 14:

https://backpack.tf/profiles/76561198062449384#!/compare/1569888000/1569974400

https://backpack.tf/profiles/76561198149467311#!/compare/1569801600/1569974400

Bulky

sale 15:

https://backpack.tf/profiles/76561198149467311#!/compare/1569974400/1570233600

https://backpack.tf/profiles/76561198254531775#!/compare/1570233600/1570320000

Bulk

Sale 16:

https://backpack.tf/profiles/76561198329433413#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198144079067#!/compare/1556668800/1568937600

SCM

Sale 17:

https://backpack.tf/profiles/76561198144079067#!/compare/1568937600/1569542400'

https://backpack.tf/profiles/76561198454615761#!/compare/1569456000/1569542400

QS

Sale 18:

https://backpack.tf/profiles/76561198313154263#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198340634356#!/compare/1567987200/1568073600

QS

Sale 19:

https://backpack.tf/profiles/76561198340634356#!/compare/1570406400/1570492800

https://backpack.tf/profiles/76561197963299583#!/compare/1569974400/1570492800

Keys

sale 20:

https://backpack.tf/profiles/76561197963299583#!/compare/1570579200/1570752000

https://backpack.tf/profiles/76561198057452720#!/compare/1570665600/1570752000

Bulk

Sale 21:

https://backpack.tf/profiles/76561198057452720#!/compare/1570752000/1570838400

https://backpack.tf/profiles/76561198454615761#!/compare/1570665600/1570752000

QS

Sale 22:

https://backpack.tf/profiles/76561198326511775#!/compare/1565740800/1565827200

https://backpack.tf/profiles/76561198340634356#!/compare/1565740800/1565827200

QS

Sale 23:

https://backpack.tf/profiles/76561198340634356#!/compare/1566259200/1566345600

https://backpack.tf/profiles/76561198041782419#!/compare/1559952000/1570838400

Keys

sale 24:

https://backpack.tf/profiles/76561198335791307#!/compare/1566950400/1567036800

https://backpack.tf/profiles/76561198114386623#!/compare/1566604800/1567036800

Sold for 6 keys

sale 25:

https://backpack.tf/profiles/76561198139515171#!/compare/1566259200/1568937600

https://backpack.tf/profiles/76561198424722948#!/compare/1567468800/1570492800

SCM

Sale 26:

https://backpack.tf/profiles/76561198305676157#!/compare/1571443200/1571529600

https://backpack.tf/profiles/76561198362983846#!/compare/1571443200/1571529600

Sold for ~2.75 keys

sale 27:

https://backpack.tf/profiles/76561198312685638#!/compare/1566345600/1566604800

https://backpack.tf/profiles/76561198225715416#!/compare/1566518400/1566604800

Bulk

Sale 28:

https://backpack.tf/profiles/76561198049378596#!/compare/1569456000/1569715200

https://backpack.tf/profiles/76561198089253101#!/compare/1569628800/1569715200

Bulky

Sale 29:

https://backpack.tf/profiles/76561198089253101#!/compare/1569801600/1569888000

https://backpack.tf/profiles/76561198454615761#!/compare/1569801600/1569888000

QS

Sale 30:

https://backpack.tf/profiles/76561198309612194#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198168863803#!/compare/1568073600/1568160000

Bulk

Sale 31:

https://backpack.tf/profiles/76561198168863803#!/compare/1568246400/1568332800

https://backpack.tf/profiles/76561198008113369#!/compare/1568332800/1568678400

Bulky

Sale 32:

https://backpack.tf/profiles/76561198382210598#!/compare/1571875200/1571961600

https://backpack.tf/profiles/76561198322530281#!/compare/1571961600/1572048000

Sold for Jarate ISY

use there

Sale 33:

https://backpack.tf/profiles/76561198322530281#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198454615761#!/compare/1571961600/1572048000

Sold for ~4 keys (QS)

Sale 34:

https://backpack.tf/profiles/76561198454615761#!/compare/1573430400/1573516800

https://backpack.tf/profiles/76561198097872842#!/compare/1573430400/1573516800

Sold for 6 keys

Sale 35:

https://backpack.tf/profiles/76561198087945631#!/compare/1567900800/1568678400

https://backpack.tf/profiles/76561198841279602#!/compare/1568592000/1568678400

QS

Sale 36:

https://backpack.tf/profiles/76561198841279602#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198119609795#!/compare/1570233600/1570320000

Sold with ~0.5 keys in sweets for 6 keys

total is ~5.5 keys

Sale 37:

https://backpack.tf/profiles/76561198827261786#!/compare/1569024000/1569110400

https://backpack.tf/profiles/76561198278756087#!/compare/1569110400/1569283200

Untrace

Sale 38:

https://backpack.tf/profiles/76561197981954308#!/compare/1570838400/1570924800

https://backpack.tf/profiles/76561198367175771#!/compare/1570752000/1570838400

Sold for ~4.56 keys

Sale 39:

https://backpack.tf/profiles/76561198454615761#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198020378175#!/compare/1568073600/1568246400

Keys

Sale 40:

https://backpack.tf/profiles/76561198284094086#!/compare/1569715200/1569801600

https://backpack.tf/profiles/76561198192204191#!/compare/1568851200/1571270400

Untrace

Sale 41:

https://backpack.tf/profiles/76561198340634356#!/compare/1571616000/1571702400

https://backpack.tf/profiles/76561198093010152#!/compare/1571702400/1571961600

Keys

sale 42:

https://backpack.tf/profiles/76561198279167936#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198390180657#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198101300189#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198880237311#!/compare/1566259200/1566432000

Untrace

Sale 43:

https://backpack.tf/profiles/76561198257264924#!/compare/1567728000/1567814400

https://backpack.tf/profiles/76561198454615761#!/compare/1567728000/1567814400

QS

sale 44:

https://backpack.tf/profiles/76561198454615761#!/compare/1571788800/1571875200

https://backpack.tf/profiles/76561198347187815#!/compare/1571788800/1571875200

Sold for 5 keys

Sale 45:

https://backpack.tf/profiles/76561198347187815#!/compare/1573430400/1573516800

https://backpack.tf/profiles/76561198998447041#!/compare/1573516800/1573516800

https://backpack.tf/profiles/76561198930778210#!/compare/1573430400/1573516800

Untrace

sale 46 - 56:

https://marketplace.tf/items/tf2/30761;5;u3006

$8.98 / $1.83 = 4.91 keys

$9.5 / $1.83 = 5.19 keys <--- https://backpack.tf/item/6667067934

$4.01 / $1.83 = 2.19 keys

$9.5 / $1.84 = 5.16 keys <---- https://backpack.tf/item/5041672803

$9.5 / $1.84 = 5.16 keys <--- https://backpack.tf/item/5095095272

$9.5 / $1.82 = 5.22 keys <---- https://backpack.tf/item/5383616427

$9.5 / $1.81 = 5.25 keys

$9.5 / $1.81 = 5.25 keys

$9.5 / $1.83 = 5.19 keys

$11.95 / $1.78 = 6.71 keys <---- https://backpack.tf/item/5170857307 | https://bot.tf/stats/listings/Y9GV12O6 B/O of 6 keys, capping

Bot.tf:

6 sales @ 6 keys,

1 sale @ 5.4 keys,

1 sale @ 5.25 keys

2 sale @ 5.2 keys,

2 sale @ 5.1 keys,

1 sale @ 5 keys,

3 sale @ 4.8 keys,

1 sale @ 4.75 keys,

1 sale @ 4.6 keys,

2 sales @ 4.2 keys

5 sales @ 4.25 keys

total sales @:

2.2

2.75

4 (x2)

4.2 (x2)

4.25 (x5)

4.55

4.6

4.75

4.8 (x3)

4.9

5 (x3)

5.1 (x2)

5.15 (x2)

5.2 (x5)

5.25 (x3)

5.4

5.5

6 (x12)

buyers up to ~4.6 keys,

2 month unsold for 6 keys,

poorly bumped seller for ~5.4 keys,

too many sales at 6 to exclude,

lets go with the rounded 5 - 6 keys.