Sale 1:

https://backpack.tf/profiles/76561199184676401#!/compare/1629763200/1629849600 - 10579610388

https://backpack.tf/profiles/76561199084784906#!/compare/1629676800/1629763200

Blaze.xTH3RM4Lx: https://backpack.tf/suggestion/615c2d2d8345594c1817cd58#comment-61883d2874e5742a85524a2c

it looks like there was a bunch of other items involved in sale 1:

https://backpack.tf/profiles/76561199184676401#!/compare/1629763200/1629849600

https://gyazo.com/927dfeece779557a9b499be6240bcff1

this would put it below buy-orders

Sale 2:

https://backpack.tf/profiles/76561199084784906#!/compare/1630108800/1630195200

https://backpack.tf/profiles/76561198087806226#!/compare/1630108800/1630195200

Untrace.

Sale 3:

https://backpack.tf/profiles/76561198087806226#!/compare/1630195200/1630281600

https://backpack.tf/profiles/76561197994697258#!/compare/1630195200/1630281600

Bulk.

Mmarketplace.tf: https://marketplace.tf/items/tf2/30307;5;u31

Sale 4:

Jul 15 - $33.3 / $1.82 = 18.30 keys

= 18 Keys.

Sale 5:

$30.99 / $1.82 = 17.03 keys

= 17 Keys.

Blaze.xTH3RM4Lx:

17 flat would probably be better here (18 sale is outdated now and there is a current seller at $31.99 (17 keys))