Sale 1:

https://backpack.tf/profiles/76561198058223674#!/compare/1566864000/1566950400

https://backpack.tf/profiles/76561198042982540#!/compare/1566864000/1566950400

Untrace

Sale 2:

https://backpack.tf/profiles/76561198243810876#!/compare/1567036800/1568160000

https://backpack.tf/profiles/76561198065746354#!/compare/1567036800/1567123200

SCM

sale 3:

https://backpack.tf/profiles/76561198081042493#!/compare/1567382400/1567468800

https://backpack.tf/profiles/76561198047422386#!/compare/1567382400/1567468800

Sold for 11 keys

sale 4:

https://backpack.tf/profiles/76561198847672167#!/compare/1561852800/1561939200

https://backpack.tf/profiles/76561197969601241#!/compare/1552176000/1562025600

Sold for 15 keys

sale 5:

https://backpack.tf/profiles/76561197969601241#!/compare/1562025600/1562112000

https://backpack.tf/profiles/76561198106795971#!/compare/1562025600/1562112000

Sold for 13 keys

sale 6:

https://backpack.tf/profiles/76561198106795971#!/compare/1562025600/1562112000

https://backpack.tf/profiles/76561198375496595#!/compare/1562025600/1562112000

Sold for ~9 keys(?)

Sale 7:

https://backpack.tf/profiles/76561198375496595#!/compare/1562025600/1562112000

https://backpack.tf/profiles/76561198847672167#!/compare/1562025600/1562112000

Sold for ~13 keys

Sale 8:

https://backpack.tf/profiles/76561198847672167#!/compare/1563235200/1563321600

https://backpack.tf/profiles/76561198131268404#!/compare/1563148800/1563235200

https://backpack.tf/profiles/76561198038203241#!/compare/1563408000/1563494400

Untrace / Gambling?

Sale 9:

https://backpack.tf/profiles/76561198038203241#!/compare/1563840000/1563926400

https://backpack.tf/profiles/76561198089253101#!/compare/1563840000/1563926400

Untrace

sale 10:

https://backpack.tf/profiles/76561198090036406#!/compare/1565049600/1565222400

https://backpack.tf/profiles/76561198184164851#!/compare/1564963200/1565049600

Untrace...

Sale 11:

https://backpack.tf/profiles/76561198184164851#!/compare/1564963200/1565049600

https://backpack.tf/profiles/76561198323733331#!/compare/1564963200/1565049600

Sold for Smoking Tree + 1 key

use there

Sale 12:

https://backpack.tf/profiles/76561198323733331#!/compare/1565481600/1565568000

https://backpack.tf/profiles/76561198220098345#!/compare/1565395200/1565654400

Sold with 10 keys for PE Conq(29)

Total is 19 keys

https://bot.tf/stats/listings/Y35008D1

B/O of 15 keys, capping

Sale 13:

https://backpack.tf/profiles/76561198220098345#!/compare/1565740800/1565827200

https://backpack.tf/profiles/76561198271942345#!/compare/1566691200/1567123200

Untrace

sale 14:

https://backpack.tf/profiles/76561198091388408#!/compare/1564185600/1565913600

https://backpack.tf/profiles/76561198337734785#!/compare/1565827200/1565913600

Sold for ~10 keys(QS)

Sale 15:

https://backpack.tf/profiles/76561198302399911#!/compare/1562284800/1562371200

https://backpack.tf/profiles/76561198153088409#!/compare/1562284800/1562371200

Sold for ~14 keys

Sale 16:

https://backpack.tf/profiles/76561198153088409#!/compare/1562889600/1562976000

https://backpack.tf/profiles/76561198275783474#!/compare/1562976000/1563062400

No direct match....

sale 17:

https://backpack.tf/profiles/76561198858501353#!/compare/1565827200/1566000000

https://backpack.tf/profiles/76561198275783474#!/compare/1565827200/1565913600

https://backpack.tf/profiles/76561198110168709#!/compare/1565740800/1565827200

Sold for 15 keys

Sale 18:

https://backpack.tf/profiles/76561198110168709#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198432461884#!/compare/1566000000/1566432000

https://backpack.tf/profiles/76561198097171432#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198088289860#!/compare/1565136000/1566086400

https://backpack.tf/profiles/76561198973894950#!/compare/1566000000/1566086400

https://backpack.tf/profiles/76561198091342225#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198043936328#!/compare/1566086400/1566172800

Gambling

Sale 19 - 23:

https://marketplace.tf/items/tf2/721;5;u62

$22.8 / $1.82 = 12.53 keys <-- https://backpack.tf/item/3574932560

$22.86 / $1.84 = 12.42 keys

$21.99 / $1.82 = 12.08 keys <-- https://backpack.tf/item/3076191658

$21.99 / $1.82 = 12.08 keys <-- https://backpack.tf/item/3500940327

$19 / $1.82 = 10.44 keys <-- https://backpack.tf/item/7957392905

Total sales @:

9, 10, 10, 11, 12, 12, 12, 13, 13, 13, 14, 15, 15, 15 keys

Buyers up to 9 keys,

Seller for 12 keys,

https://bot.tf/stats/listings/MGZ789RQ

Unsold for almost a month at 12 keys, dropped from 14 keys,

taking 10 - 15 keys, should be better to include most sales.