Sale 1, 2, 3:

https://backpack.tf/item/13877113336 - Only found one history

https://backpack.tf/profiles/76561199533840476#!/compare/1752451200/1752537600

https://marketplace.tf/items/tf2/5021;6

Sold for $34.99 on the 16.05 & 17.05

Sold for $39.99 on the 15.07

Keys were

https://marketplace.tf/items/tf2/5021;6

16.05 - $1.94

17.05 = $1.95

15.07 = $2.01

16.05 sale (34.99/1.94) = 18.03

17.05 sale (34.99/1.95 = 17.94

15.07 sale (39.99/2.01) = 19.8

Rounding the May sales to 18 keys

Rounding the June sale to 20 keys

Sale 4:

https://backpack.tf/item/13877113336

https://backpack.tf/profiles/76561198001166004#!/compare/1748304000/1748476800

https://backpack.tf/profiles/76561198244962432#!/compare/1748390400/1748563200

Bulk, inventory purchase

Sale 5:

https://backpack.tf/item/15508557792

https://backpack.tf/profiles/76561198850121720#!/compare/1748304000/1748390400

https://backpack.tf/profiles/76561198172334113#!/compare/1748390400/1749340800

Sold for 17 keys and 35 ref checked all keys and ref on buyers side :(

Rounding this sale to 18 keys

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Sales:

x3 @ 18 keys

x1 @ 20 keys

Considering there is an unsold at 18 keys for 1+ month

https://backpack.tf/item/14834165113

https://imgur.com/a/99InFVM

Considering the 20 key sale an outlier

Going with 18 keys flat