Item 1

https://backpack.tf/item/12706905745

Sale 1

https://backpack.tf/profiles/76561198374436191#!/compare/1681776000/1681776000

https://backpack.tf/profiles/76561199373062054#!/compare/1676851200/1681776000

No clue

Sale 2

https://backpack.tf/profiles/76561199373062054#!/compare/1676851200/1681776000

https://backpack.tf/profiles/76561199215904293#!/compare/1681430400/1681776000

Can't load seller inv

Sale 3

https://backpack.tf/profiles/76561199215904293#!/compare/1682985600/1683072000

https://backpack.tf/profiles/76561199072654974#!/compare/1682985600/1683072000

Untrace on buyer side, can only match like 2 keys on seller side

Sale 4

https://backpack.tf/profiles/76561199072654974#!/compare/1683072000/1683158400

https://backpack.tf/profiles/76561198148511293#!/compare/1682899200/1683072000

Untrace on seller side

Item 2

https://backpack.tf/item/12596106860

Sale 5

https://backpack.tf/profiles/76561198311498888#!/compare/1683936000/1684022400

https://backpack.tf/profiles/76561198345004973#!/compare/1683936000/1684022400

Can match 7 keys, STN sell order likely changed by then

Item 3

https://backpack.tf/item/12472800151

Sale 6

https://backpack.tf/profiles/76561199127652476#!/compare/1686268800/1686441600

https://backpack.tf/profiles/76561199161916038#!/compare/1686182400/1686355200

No clue

Sale 7

https://backpack.tf/profiles/76561199161916038#!/compare/1687564800/1687651200

https://backpack.tf/profiles/76561198103923541#!/compare/1687305600/1688342400

No clue

Item 4

https://backpack.tf/item/12068896193

Sale 8

https://backpack.tf/profiles/76561199059698603#!/compare/1684972800/1685059200

https://backpack.tf/profiles/76561198309845771#!/compare/1684195200/1687996800

11 keys?

Item 5

https://backpack.tf/item/11845510368

Sale 9

https://backpack.tf/profiles/76561199203680409#!/compare/1685491200/1685577600

https://backpack.tf/profiles/76561198112821447#!/compare/1685577600/1685664000

Looks like ~8 keys

Sale 10

https://backpack.tf/profiles/76561198112821447#!/compare/1685577600/1685664000

https://backpack.tf/profiles/76561199161916038#!/compare/1685664000/1685750400

Can't load seller inv

Sale 11

https://backpack.tf/profiles/76561199161916038#!/compare/1685750400/1685923200

https://backpack.tf/profiles/76561199245733895#!/compare/1685750400/1685836800

No clue

Sale 12

https://backpack.tf/profiles/76561199245733895#!/compare/1685923200/1686009600

https://backpack.tf/profiles/76561198798176670#!/compare/1676851200/1686268800

No clue

Sale 13

https://backpack.tf/profiles/76561198798176670#!/compare/1686268800/1686528000

https://backpack.tf/profiles/76561198056065060#!/compare/1686873600/1688428800

No clue

Mp.tf

https://marketplace.tf/items/tf2/31239;5;u3001

$24.99 / $1.99 = ~13 keys (Jun 3)

Total Sales

7, 8, 11, 13

https://imgur.com/a/OlzpIct

2 months at 8 says 11 and above is too high

Taking 7 - 8 keys c: