Item 1

https://backpack.tf/item/13173712679

Sale 1

https://backpack.tf/profiles/76561198850274253#!/compare/1688083200/1688169600

https://backpack.tf/profiles/76561198137735757#!/compare/1685232000/1688169600

Can't really say for sure here

Sale 2

https://backpack.tf/profiles/76561198137735757#!/compare/1685232000/1688169600

https://backpack.tf/profiles/76561198134813395#!/compare/1688083200/1688601600

Can't load seller inv

Item 2

https://backpack.tf/item/12917258140

Sale 3

https://backpack.tf/profiles/76561198142115831#!/compare/1681603200/1682380800

https://backpack.tf/profiles/76561198362305972#!/compare/1682294400/1682380800

No clue

Sale 4

https://backpack.tf/profiles/76561198362305972#!/compare/1682553600/1682726400

https://backpack.tf/profiles/76561198150382528#!/compare/1682467200/1683158400

17 keys

Item 3

https://backpack.tf/item/12851073053

Sale 5

https://backpack.tf/profiles/76561199192607141#!/compare/1682553600/1682640000

https://backpack.tf/profiles/76561199119408937#!/compare/1683676800/1685664000

No clue

Item 4

https://backpack.tf/item/12585220554

Sale 6

https://backpack.tf/profiles/76561198850178158#!/compare/1681948800/1682035200

https://backpack.tf/profiles/76561198180316610#!/compare/1682035200/1685404800

No clue

Item 5

https://backpack.tf/item/12563818072

Sale 7

https://backpack.tf/profiles/76561199192607141#!/compare/1682294400/1682380800

https://backpack.tf/profiles/76561198011134507#!/compare/1683590400/1683676800

No clue

Item 6

https://backpack.tf/item/12525178052

Sale 8

https://backpack.tf/profiles/76561199059698603#!/compare/1682035200/1682121600

No clue who bought it

Sale 9

Covering mp.tf at the end

Sale 10

https://backpack.tf/profiles/76561199192607141#!/compare/1683504000/1683590400

https://backpack.tf/profiles/76561198165742995#!/compare/1683504000/1683590400

Keys don't match on buyer side, I can't say for sure here

Item 7

https://backpack.tf/item/12513078369

Sale 11

https://backpack.tf/profiles/76561198115913418#!/compare/1682121600/1683072000

https://backpack.tf/profiles/76561197991692581#!/compare/1678924800/1686096000

No clue

Item 8

https://backpack.tf/item/12506029076

Sale 12

https://backpack.tf/profiles/76561198311498888#!/compare/1682899200/1682985600

https://backpack.tf/profiles/76561198994367071#!/compare/1678233600/1687305600

I can't match keys

Item 9

https://backpack.tf/item/12481950532

Sale 13

https://backpack.tf/profiles/76561199103991885#!/compare/1685232000/1685318400

https://backpack.tf/profiles/76561198050545440#!/compare/1684281600/1685491200

No clue

Sale 14

https://backpack.tf/profiles/76561198050545440#!/compare/1686441600/1687046400

https://backpack.tf/profiles/76561198072863414#!/compare/1687132800/1687219200

Cosmic Constellations Arctic Mole + ~3 keys in adds < - - > 30 keys

30 - 3 = ~27 keys

Item 10

https://backpack.tf/item/12459487780

Sale 15

https://backpack.tf/profiles/76561198148694767#!/compare/1682640000/1683158400

https://backpack.tf/profiles/76561198155101393#!/compare/1682899200/1682985600

Green Energy Elf Defense + 3 keys

Mini for the Green Energy Elf Defense 17 keys

17 + 3 = 20 keys

Sale 16

https://backpack.tf/profiles/76561198155101393#!/compare/1683331200/1683417600

https://backpack.tf/profiles/76561198981159652#!/compare/1678233600/1683676800

No clue

Sale 17

https://backpack.tf/profiles/76561198981159652#!/compare/1684022400/1684540800

https://backpack.tf/profiles/76561198080162526#!/compare/1684368000/1684540800

No clue

Item 11

https://backpack.tf/item/12444443023

Sale 18

Transfer back to bot owner

Sale 19

https://backpack.tf/profiles/76561199082971157#!/compare/1689033600/1689120000

https://backpack.tf/profiles/76561198030553563#!/compare/1689033600/1689292800

Can't load seller inv

Mp.tf

https://marketplace.tf/items/tf2/31333;5;u274

$89.99 / $2.10 = ~43 keys (Apr 20)

$49.99 / $2.02 = ~25 keys (May 8)

$49.99 / $1.99 = ~25 keys (May 29)

$49.99 / $2.00 = ~25 keys (Jul 4)

Total Sales

17, 20, 25, 25, 25, 27, 43

https://imgur.com/a/CYfIzQh

27 and above seems a bit high

Taking 17 - 25 keys c: