Sale 1:

https://backpack.tf/profiles/76561198439498211#!/compare/1620518400/1620604800 Bought at 10 keys from scrap.tf auction on 5/9/21

Sale 2:

https://backpack.tf/profiles/76561198348395086#!/compare/1619913600/1620000000 Traded for Kill-A-Watt Connoisseur's Cap (Last suggestion at around 16 keys, may be very outdated) on 5/2/21

Sale 3:

https://backpack.tf/profiles/76561198292848229#!/compare/1619308800/1619740800 Sold for 9 keys 27 ref (9.4655 keys) on 4/30/21

Rest are retrades or bot trades

Current key price: 58 ref

AVG: (10 + 16 + 9.4655)/3 = 11.8218 keys

Rounded to 12 according to unusual pricing rules

(First actual suggestion please tell me how I did or anything I could do better)