History 1: https://backpack.tf/item/8187091482

Untraceable:

https://backpack.tf/profiles/76561198147282699#!/compare/1605571200/1607472000

https://backpack.tf/profiles/76561198280693486#!/compare/1606867200/1607040000

Untraceable:

https://backpack.tf/profiles/76561198280693486#!/compare/1607212800/1607299200

https://backpack.tf/profiles/76561198134805229#!/compare/1603411200/1611532800

History 2: https://backpack.tf/item/8176887046

Tradebacks + deposit to Mannco.Store

History 3: https://backpack.tf/item/6976670063

Mannco.Store sale

History 4: https://backpack.tf/item/6296941185

Deposit to Marketplace.tf

History 5: https://backpack.tf/item/6262512661

4 keys (the Strange Bat Hat matched in the seller's compare but the histories don't match)

https://backpack.tf/profiles/76561198850274253#!/compare/1604188800/1604275200

https://backpack.tf/profiles/76561198275737484#!/compare/1604275200/1604361600

History 6: https://backpack.tf/item/6253018917

Marketplace.tf sale

Marketplace.tf sales: https://marketplace.tf/items/tf2/30876;5;u3026

November 3: $9.4/1.82=5.16 ~5.15 keys

November 13: $6.99/1.79=3.91 ~3.9 keys

November 15: $7/1.78=3.93 ~3.95 keys

January 21: $9.99/2.1=4.76 ~4.75 keys

Mannco.Store Sales: https://mannco.store/item/23421

December 15: $10/1.61=6.21 ~6.2 keys

Unsolds: Mannco.store $9.99/1.85=5.4 keys ~1 month

Sales at 3.9, 3.95, 4, 4.75, 5.15, 6.2

6.2 looks like an outlier given the unsold at 5.4 for around a month

Gonna go 3.9-5.15 (rounded to the nearest 0.05 keys since the median is below 5)