Sale 1:

https://backpack.tf/profiles/76561197999873164#!/compare/1571011200/1571097600

https://backpack.tf/profiles/76561198215116737#!/compare/1571356800/1571443200

untrace

sale 2:

https://backpack.tf/profiles/76561198215116737#!/compare/1571443200/1571702400

https://backpack.tf/profiles/76561198323565601#!/compare/1571356800/1571443200

QS

sale 3:

https://backpack.tf/profiles/76561198105972756#!/compare/1567641600/1568073600

https://backpack.tf/profiles/76561198323565601#!/compare/1567641600/1567728000

Untrace

Sale 4:

https://backpack.tf/profiles/76561198089253101#!/compare/1568246400/1568332800

https://backpack.tf/profiles/76561198153833965#!/compare/1568419200/1568678400

Untrace

Sale 5:

https://backpack.tf/profiles/76561198316983692#!/compare/1568764800/1571788800

https://backpack.tf/profiles/76561198121830870#!/compare/1571702400/1571788800

QS

sale 6:

https://backpack.tf/profiles/76561198121830870#!/compare/1571875200/1571961600

https://backpack.tf/profiles/76561198086749028#!/compare/1571875200/1571961600

Sold for 6 keys

Sale 7:

https://backpack.tf/profiles/76561198086749028#!/compare/1571875200/1571961600

https://backpack.tf/profiles/76561198070956120#!/compare/1571875200/1571961600

untrace

sale 8:

https://backpack.tf/profiles/76561198070956120#!/compare/1572048000/1572134400

https://backpack.tf/profiles/76561198123912038#!/compare/1571961600/1572048000

Bulk

sale 9:

https://backpack.tf/profiles/76561198123912038#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198081332647#!/compare/1571961600/1572048000

sold for ~7 keys

Sale 10:

https://backpack.tf/profiles/76561198081332647#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198096848852#!/compare/1571788800/1572048000

Sold with ~2 keys in sweets for P Fetti Bonk

Bonk Mini:

https://backpack.tf/suggestion/5dcb1e94d38172093d0d8a85

suggestion for 9 keys

Total is 7 keys

Sale 11:

https://backpack.tf/profiles/76561198096848852#!/compare/1571788800/1572048000

https://backpack.tf/profiles/76561198161264043#!/compare/1573257600/1573344000

Untrace

Sale 12:

https://backpack.tf/profiles/76561198178378209#!/compare/1566000000/1568246400

https://backpack.tf/profiles/76561198085797043#!/compare/1567468800/1567641600

Sold with ~0.5 keys in sweets for ~6.5 keys in sweets

total is ~6 keys

Sale 13:

https://backpack.tf/profiles/76561198028512889#!/compare/1569283200/1570579200

https://backpack.tf/profiles/76561198351218484#!/compare/1566518400/1569628800

SCM

sale 14:

https://backpack.tf/profiles/76561198351218484#!/compare/1571529600/1572220800

https://backpack.tf/profiles/76561198444144864#!/compare/1571961600/1572220800

SCM

Sale 15:

https://backpack.tf/profiles/76561198083626821#!/compare/1572566400/1572825600

https://backpack.tf/profiles/76561198141477086#!/compare/1572652800/1572739200

https://backpack.tf/profiles/76561198095812833#!/compare/1572652800/1572739200

Untrace

Sale 16:

https://backpack.tf/profiles/76561198358617021#!/compare/1572566400/1572825600

https://backpack.tf/profiles/76561197960876323#!/compare/1571788800/1572825600

untrace

sale 17:

https://backpack.tf/profiles/76561198099647700#!/compare/1568073600/1569801600

https://backpack.tf/profiles/76561198266724619#!/compare/1567641600/1568505600

SCM

Sale 18:

https://backpack.tf/profiles/76561198266724619#!/compare/1568937600/1569283200

https://backpack.tf/profiles/76561198323565601#!/compare/1569024000/1569196800

Untrace

sale 19:

https://backpack.tf/profiles/76561198240553610#!/compare/1569024000/1569110400

https://backpack.tf/profiles/76561198435616443#!/compare/1569024000/1569542400

untrace

Sale 20:

https://backpack.tf/profiles/76561198842451877#!/compare/1569888000/1571184000

https://backpack.tf/profiles/76561198061586550#!/compare/1569888000/1569974400

SCM

Sale 21:

https://backpack.tf/profiles/76561198061586550#!/compare/1571616000/1571702400

https://backpack.tf/profiles/76561198157678356#!/compare/1571616000/1571702400

Sold for ~7.5 keys in sweets

sale 22:

https://backpack.tf/profiles/76561198157678356#!/compare/1571788800/1571875200

https://backpack.tf/profiles/76561198298292652#!/compare/1571788800/1571875200

Sold with ~1 key in sweets for TW Counter

sale 23:

https://backpack.tf/profiles/76561198298292652#!/compare/1571875200/1571961600

https://backpack.tf/profiles/76561198043485433#!/compare/1571961600/1572048000

Sold for 7 keys

Sale 24:

https://backpack.tf/profiles/76561198043485433#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198400086732#!/compare/1571961600/1572048000

Bulk

Sale 25:

https://backpack.tf/profiles/76561198400086732#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198249078668#!/compare/1571961600/1572048000

Sold for 8 keys

Sale 26:

https://backpack.tf/profiles/76561198058875156#!/compare/1566259200/1573257600

https://backpack.tf/profiles/76561198268901284#!/compare/1520035200/1568764800

SCM

Sale 27:

https://backpack.tf/profiles/76561198268901284#!/compare/1568937600/1573516800

https://backpack.tf/profiles/76561198156780616#!/compare/1569110400/1569283200

https://backpack.tf/profiles/76561198323565601#!/compare/1569196800/1569283200

Untrace

sale 28:

https://backpack.tf/profiles/76561198210225228#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198393842542#!/compare/1559174400/1571270400

SCM

Sale 29:

https://backpack.tf/profiles/76561198050933686#!/compare/1567987200/1568073600

'https://backpack.tf/profiles/76561198048551862#!/compare/1567641600/1568419200

Untrace

sale 30:

https://backpack.tf/profiles/76561198048551862#!/compare/1568419200/1568505600

https://backpack.tf/profiles/76561198311390944#!/compare/1568419200/1568505600

sold with negligible sweets for ~8.5 keys in sweets

sale 31:

https://backpack.tf/profiles/76561198311390944#!/compare/1568505600/1568592000

https://backpack.tf/profiles/76561198332653119#!/compare/1568419200/1568592000

Sold with ~8.5 keys in sweets

Sale 32:

https://backpack.tf/profiles/76561198332653119#!/compare/1568419200/1568592000

https://backpack.tf/profiles/76561198079438612#!/compare/1568505600/1568592000

Can trace a sniper

Sale 33:

https://backpack.tf/profiles/76561198079438612#!/compare/1568592000/1568678400

https://backpack.tf/profiles/76561198169939863#!/compare/1568505600/1568592000

Sold with ~3 keys in sweets for G Fetti Warm-Up

use there

sale 34:

https://backpack.tf/profiles/76561198169939863#!/compare/1568592000/1568851200

https://backpack.tf/profiles/76561198161711912#!/compare/1569196800/1569456000

untrace

Sale 35:

https://backpack.tf/profiles/76561198163890959#!/compare/1569542400/1571702400

https://backpack.tf/profiles/76561198323565601#!/compare/1569456000/1569542400

QS

sale 36:

https://backpack.tf/profiles/76561198089253101#!/compare/1571356800/1571443200

https://backpack.tf/profiles/76561198276180428#!/compare/1571616000/1571702400

Untrace

sale 37:

https://backpack.tf/profiles/76561198276180428#!/compare/1572652800/1572825600

https://backpack.tf/profiles/76561198097865704#!/compare/1572739200/1572825600

Bulky

sale 38:

https://backpack.tf/profiles/76561198097865704#!/compare/1572825600/1572912000

https://backpack.tf/profiles/76561198287077426#!/compare/1572825600/1572912000

Sold for ~9.5 keys in sweets

Sale 39:

https://backpack.tf/profiles/76561198287077426#!/compare/1572912000/1573171200

https://backpack.tf/profiles/76561198066448774#!/compare/1572652800/1572998400

Bulk

Sale 40:

https://backpack.tf/profiles/76561198066448774#!/compare/1572998400/1573084800

https://backpack.tf/profiles/76561197999873164#!/compare/1572912000/1572998400

Sold for ~6.5 keys (some keys grouped together are not part of sale)

Sale 41:

https://backpack.tf/profiles/76561198048851745#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198349218131#!/compare/1570147200/1570233600

Sold for ~6.5 keys

Sale 42:

https://backpack.tf/profiles/76561198072181775#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198436821198#!/compare/1568764800/1568937600

Sold for ~7.5 keys

Sale 43:

https://backpack.tf/profiles/76561198436821198#!/compare/1569110400/1569196800

https://backpack.tf/profiles/76561198123720508#!/compare/1566777600/1569110400

Sold with ~1 key in sweets for ~8.5 keys in sweets

total is 7.5 keys

Sale 44:

https://backpack.tf/profiles/76561198852224527#!/compare/1565827200/1565913600

https://backpack.tf/profiles/76561198323565601#!/compare/1565827200/1565913600

QS

Sale 45:

https://backpack.tf/profiles/76561198045358018#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198121830870#!/compare/1567123200/1567209600

QS

Sale 46:

https://backpack.tf/profiles/76561198121830870#!/compare/1567814400/1567900800

https://backpack.tf/profiles/76561198873428867#!/compare/1567296000/1567900800

Sold for 7 keys

Sale 47:

https://backpack.tf/profiles/76561198873428867#!/compare/1569024000/1571356800

https://backpack.tf/profiles/76561198323565601#!/compare/1571529600/1571616000

QS

Sale 48 -51:

https://marketplace.tf/items/tf2/30182;5;u59

$16.2 / $1.81 = 8.95 keys

$16.1 / $1.81 = 8.90 keys

$16.2 / $1.81 = 8.95 keys

$16.8 / $1.80 = 9.33 keys

Total sales @:

6 (x2)

6.5 (x2)

7 (x3)

7.5 (x3)

8

8.5 (x2)

9 (x3)

9.5 (x2)

buyers up to ~6 keys,

sellers at 10 keys,

let's go with 6.5 - 9.5 keys