Sale 1 was 16 keys + 2 Gaelic Gluttons (2.45) = 18 keys, once rounded

Strange one was ~1.6 keys at the time https://gladiator.tf/listings/612260dc8060e81faadb00fd

Unique one was ~0.85 keys at the time https://gladiator.tf/listings/6122ce628b4f983df9f6c514

Missed sales, please evaluate all the sales in future.

https://backpack.tf/profiles/76561198069363875#!/compare/1623628800/1623801600 - Sold via buy order which were around 10 keys at the time https://gladiator.tf/listings/60c680be84dd3404026178b7

It sold to Cheem bot, which is owned by 'sp' who deposited it on mp.tf, hence why the history is weird

https://backpack.tf/profiles/76561198142864294#!/compare/1630281600/1630368000 - Sold with 36 ref (~0.6 keys) for 15 keys = 14 keys, once rounded

https://backpack.tf/profiles/76561198275179989#!/compare/1629676800/1629763200

https://backpack.tf/profiles/76561198142864294#!/compare/1629590400/1629763200 - Only 6 match, incomplete

https://backpack.tf/profiles/76561198418740133#!/compare/1629590400/1629676800

https://backpack.tf/profiles/76561198275179989#!/compare/1629504000/1629676800 - Spelled Bills, Bucks + 1 key, I wouldn't use this to price here

https://backpack.tf/profiles/76561199038986058#!/compare/1630454400/1630540800

https://backpack.tf/profiles/76561199084784906#!/compare/1630368000/1630454400 - Sold for a bunch of sweets, below buyers

https://backpack.tf/profiles/76561198280524116#!/compare/1630368000/1630454400

https://backpack.tf/profiles/76561199084784906#!/compare/1630454400/1630540800 - 15 keys match here

https://gladiator.tf/listings/612f7067089329fb97ecb0d1 - Likely that 30 ref was added also. This will round to 16 keys

Overall sales:

10, 14, 16, 16, 17 and 18

10 is below buyers but supports 14. I would take 14 -18 here.