Sale 1:

https://backpack.tf/profiles/76561198135116390#!/compare/1566000000/1566259200

https://backpack.tf/profiles/76561198052043171#!/compare/1566172800/1566259200

Sold for 8 keys

Sale 2:

https://backpack.tf/profiles/76561198052043171#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198188484666#!/compare/1552867200/1566432000

Untrace

Sale 3:

https://backpack.tf/profiles/76561198188484666#!/compare/1566777600/1568246400

https://backpack.tf/profiles/76561198337734785#!/compare/1566777600/1566864000

QS

Sale 4:

https://backpack.tf/profiles/76561198337734785#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198950621219#!/compare/1567814400/1568073600

Untrace / bulk?

Sale 5:

https://backpack.tf/profiles/76561198950621219#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198084367252#!/compare/1568073600/1568160000

Untrace

Sale 6:

https://backpack.tf/profiles/76561198250407098#!/compare/1565913600/1566172800

https://backpack.tf/profiles/76561198002757046#!/compare/1566086400/1566172800

Sold for ~7 keys

Sale 7:

https://backpack.tf/profiles/76561198002757046#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198279539667#!/compare/1567987200/1568073600

Untrace

Sale 8:

https://backpack.tf/profiles/76561198279539667#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198973894950#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198089253101#!/compare/1568073600/1568160000

Untrace

Sale 9:

https://backpack.tf/profiles/76561198135347065#!/compare/1566172800/1566432000

https://backpack.tf/profiles/76561198363395191#!/compare/1566345600/1566432000

Keys...

Sale 10:

https://backpack.tf/profiles/76561198363395191#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198117834823#!/compare/1567209600/1567296000

Sold for ~8 keys

Sale 11:

https://backpack.tf/profiles/76561198117834823#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198204215081#!/compare/1567209600/1567296000

Sold with 2 keys for KaW Mountain

use there

Sale 12:

https://backpack.tf/profiles/76561198204215081#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198143581382#!/compare/1567209600/1567382400

Sold for TW Reason

use there

Sale 13:

https://backpack.tf/profiles/76561198012969318#!/compare/1566345600/1566518400

https://backpack.tf/profiles/76561198089253101#!/compare/1566432000/1566518400

Sold for 8 keys

Sale 14:

https://backpack.tf/profiles/76561198119161228#!/compare/1561680000/1562112000

https://backpack.tf/profiles/76561198152314843#!/compare/1562025600/1562112000

Sold for DP Noir + ~1 key in sweets

Use there

Sale 15:

https://backpack.tf/profiles/76561198152314843#!/compare/1562112000/1562198400

https://backpack.tf/profiles/76561198060410316#!/compare/1562112000/1562198400

Sold for 12 keys (may need a double count)

Sale 16:

https://backpack.tf/profiles/76561198060410316#!/compare/1562112000/1562198400

https://backpack.tf/profiles/76561198240596970#!/compare/1562112000/1562198400

Def keys, can't tell how many.

Sale 17:

https://backpack.tf/profiles/76561198240596970#!/compare/1562112000/1562198400

https://backpack.tf/profiles/76561198114924746#!/compare/1562112000/1562198400

Sold for 13 keys

Sale 18:

https://backpack.tf/profiles/76561198114924746#!/compare/1562284800/1562371200

https://backpack.tf/profiles/76561198033378852#!/compare/1562284800/1562371200

Untrace

Sale 19:

https://backpack.tf/profiles/76561198033378852#!/compare/1563148800/1563235200

https://backpack.tf/profiles/76561198191196389#!/compare/1561507200/1563235200

Untrace

Sale 20:

https://backpack.tf/profiles/76561198191196389#!/compare/1561507200/1563235200

https://backpack.tf/profiles/76561198403266712#!/compare/1563148800/1563235200

Sold with ~3.5 keys in sweets for ~17 keys in sweets

Total is 14 keys, .5 nulled by sweets added with 17 keys

Sale 21:

https://backpack.tf/profiles/76561198403266712#!/compare/1563235200/1563321600

https://backpack.tf/profiles/76561198319589832#!/compare/1563235200/1563321600

Sold for 10 keys (split in 2 groups of 5?)

Sale 22:

https://backpack.tf/profiles/76561198319589832#!/compare/1563235200/1563321600

https://backpack.tf/profiles/76561198102263461#!/compare/1563235200/1563408000

Sold for DP Cotton(20.5) + negligible sweets

Sale 23:

https://backpack.tf/profiles/76561198102263461#!/compare/1563235200/1563408000

https://backpack.tf/profiles/76561198866566566#!/compare/1563321600/1563408000

Sold with ~2 keys in sweets for KaW Tavish

use there

Sale 24:

https://backpack.tf/profiles/76561198866566566#!/compare/1563321600/1563408000

https://backpack.tf/profiles/76561198088038722#!/compare/1563321600/1563408000

Sold with ~2 keys in sweets for PE Elfin(17)

Total is 15 keys

Sale 25:

https://backpack.tf/profiles/76561198088038722#!/compare/1563494400/1563580800

https://backpack.tf/profiles/76561198132389479#!/compare/1563321600/1563580800

Sold for 18 keys

Sale 26:

https://backpack.tf/profiles/76561198132389479#!/compare/1563321600/1563580800

https://backpack.tf/profiles/76561198075815619#!/compare/1563494400/1563580800

Untrace

Sale 27:

https://backpack.tf/profiles/76561198075815619#!/compare/1563494400/1563580800

https://backpack.tf/profiles/76561198350704417#!/compare/1563580800/1563667200

Sold for OF Tundra(19.5)

Sale 28:

https://backpack.tf/profiles/76561198350704417#!/compare/1563580800/1563667200

https://backpack.tf/profiles/76561198384134597#!/compare/1562371200/1564531200

Sold for Aces Falkirk

use there, sales far apart...

Sale 29:

https://backpack.tf/profiles/76561198106764336#!/compare/1567555200/1567728000

https://backpack.tf/profiles/76561198363395191#!/compare/1567641600/1567728000

Untrace

Sale 30:

https://backpack.tf/profiles/76561198363395191#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198279539667#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198279539667#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198069580305#!/compare/1567296000/1567987200

https://backpack.tf/profiles/76561198074718149#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198432461884#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198822711927#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198089253101#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198822711927#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198044344440#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198950621219#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198089253101#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198973894950#!/compare/1568073600/1568160000

Untrace

Sale 31:

https://marketplace.tf/items/tf2/30071;5;u59

$45 / $1.85 = 24.32 keys

Sale 32:

https://backpack.tf/profiles/76561198084367252#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198950621219#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198068234401#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198074718149#!/compare/1568764800/1568937600

https://backpack.tf/profiles/76561198964658472#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198074718149#!/compare/1568764800/1568937600

https://backpack.tf/profiles/76561198087739743#!/compare/1568678400/1569024000

https://backpack.tf/profiles/76561197961620355#!/compare/1568937600/1569024000

https://backpack.tf/profiles/76561198043662502#!/compare/1569024000/1569110400

https://backpack.tf/profiles/76561198950621219#!/compare/1569369600/1569456000

https://backpack.tf/profiles/76561198973894950#!/compare/1569456000/1569542400

https://backpack.tf/profiles/76561198154782261#!/compare/1569369600/1569542400

nothing but gmabling / untrace

Sale 33:

https://backpack.tf/item/7956977128

More gambling.

Total sales @:

7, 8, 8, 8, 10, 12, 13, 14, 15, 18, 19.5, 20.5, 24.32 keys

Taking a look at use there sales:

TW Reason would end up around 10 keys,

DP Noir could end up ~11 keys,

KaW Mountain would end up ~18,

KaW Tavish would end up ~14,

buyers up to ~7.5 keys,

seller aging for 13 keys,

taking 8 - 18 keys, large range that conserves around seller and includes most sales... (supported by possible use there sales)