Counter to current open suggestion! Credits to oopsboom24 for their sales and Xergoyf for providing the better range that should be used given sales!

Item 1

https://backpack.tf/item/13754575658

Sale #1

Untraceable? Enough keys do not match in the buyer's side to consider this below buyers-

Seller: https://backpack.tf/profiles/76561198308883028#!/compare/1700611200/1701993600

Buyer: https://backpack.tf/profiles/76561198047302760#!/compare/1700697600/1700784000

Sale #2

Sold for 20 keys (keys in the buyer's side match)-

Seller: https://backpack.tf/profiles/76561198047302760#!/compare/1703030400/1703462400

Buyer: https://backpack.tf/profiles/76561198045955679#!/compare/1703376000/1703462400

Item 2

https://backpack.tf/item/13708106706

Sale #3

Untraceable?-

Seller: https://backpack.tf/profiles/76561198261016373#!/compare/1698192000/1698624000

Buyer: https://backpack.tf/profiles/76561198109986831#!/compare/1698537600/1698624000

Sale #4

Sold for 18 keys (keys in the bulk match)-

Seller: https://backpack.tf/profiles/76561198109986831#!/compare/1701216000/1701388800

Buyer: https://backpack.tf/profiles/76561199105248648#!/compare/1701302400/1701475200

Sale #5

Sold for 30 keys? (screenshot in the last suggestion was working but not anymore so not really sure if I can tell the amount here)-

Seller: https://backpack.tf/profiles/76561199105248648#!/compare/1704844800/1704931200

Buyer: https://backpack.tf/profiles/76561197995973040#!/compare/1704672000/1704931200

Sales @ 18, 20, 30?

Taking 18-20 here :3