Sale 1:

https://marketplace.tf/items/tf2/30798;5;u109

$34.95 / $1.81 = 19.31 keys

https://backpack.tf/item/5248356516

Sale 2:

SCM

https://backpack.tf/profiles/76561198103073095#!/compare/1570752000/1571184000

https://backpack.tf/profiles/76561197970688218#!/compare/1569628800/1569715200

Sale 3:

untrace

https://backpack.tf/profiles/76561198073083174#!/compare/1567123200/1569888000

https://backpack.tf/profiles/76561198080179568#!/compare/1567296000/1567382400

Sale 4:

untrace

https://backpack.tf/profiles/76561198080179568#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198070980833#!/compare/1568073600/1568246400

Sale 5:

untrace, probs bot QS

https://backpack.tf/profiles/76561198070980833#!/compare/1571616000/1571788800

https://backpack.tf/profiles/76561198394877897#!/compare/1571702400/1571788800

Sale 6:

15 keys + 12 ref

https://backpack.tf/profiles/76561198164512690#!/compare/1571616000/1571702400

https://backpack.tf/profiles/76561198002757046#!/compare/1571616000/1571702400

Sale 7:

20 keys

https://backpack.tf/profiles/76561198394877897#!/compare/1572127200/1572213600

Sale 8:

untrace

https://backpack.tf/profiles/76561198002757046#!/compare/1572048000/1572134400

https://backpack.tf/profiles/76561198950621219#!/compare/1572048000/1572134400

after this sale^ this was gambled around before being dumped to buy order:

https://backpack.tf/item/5201883298

Sale 9:

20 keys

only 10 keys traceable, bot.tf shows it sold for 20, if this sale is not certain it still falls within the range

https://backpack.tf/profiles/76561198394877897#!/compare/1573084800/1573171200

https://backpack.tf/profiles/76561198280802716#!/compare/1573084800/1573171200

Sale 10:

using on Toque

https://backpack.tf/profiles/76561198084367252#!/compare/1573171200/1573257600

https://backpack.tf/profiles/76561198280802716#!/compare/1573171200/1573257600

Sale 11:

21.5 rounds to 22 keys

DBD Gilded Guard(15.5 keys) + 6 keys

https://imgur.com/a/XIqcxGM

no b/o

https://backpack.tf/profiles/76561198084367252#!/compare/1573257600/1573344000

https://backpack.tf/profiles/76561198224899376#!/compare/1573257600/1573344000

==============================================================================

bot.tf stats:

https://imgur.com/a/CpLhkyk

Buys are sale 7 and sale 9

buy orders at 15.4 keys:

https://imgur.com/a/hjmIIQD

Sales:

15,19,20,(20?),22