History 1: https://backpack.tf/item/7957370525

Marketplace.tf

History 2: https://backpack.tf/item/7956972499

Untraceable:

https://backpack.tf/profiles/76561198248509344#!/compare/1618272000/1618444800

https://backpack.tf/profiles/76561198209249621#!/compare/1618358400/1618704000

7 keys 31 ref match, ~7.5 keys, sold to a quickbuyer:

https://backpack.tf/profiles/76561198209249621#!/compare/1618272000/1618358400

https://backpack.tf/profiles/76561198002757046#!/compare/1618272000/1618358400

Sold for 10 keys 4 ref in ~1 day:

https://backpack.tf/profiles/76561198002757046#!/compare/1618272000/1618358400

https://backpack.tf/profiles/76561198080179568#!/compare/1618272000/1618358400

Then went to Marketplace.tf

History 3: https://backpack.tf/item/3726265817

13 keys 6.33 ref, ~13 keys:

https://backpack.tf/profiles/76561199106217370#!/compare/1619740800/1619827200

https://backpack.tf/profiles/76561198871795266#!/compare/1619654400/1619827200

Marketplace.tf: https://marketplace.tf/items/tf2/30136;5;u58

May 15: $29.9/2=14.95 ~15 keys

June 7: $31.99/1.96=16.32 ~16 keys

None of these had buyouts

Sales at 7.5, 10, 13, 15, 16

7.5 and 10 sold really quick and are now below buyers

15 and 16 were Marketplace.tf, and to me excluding them will balance out the range.

I think 13 flat will work here tbh, given it's pure, having 2 outliers on each side