Counter suggestion, credit to Yddub for originally suggesting it and Shuffle Spy for adding sales

Original suggestion: https://backpack.tf/suggestion/5ff133932704b64c725b9e55

400 keys:

https://backpack.tf/profiles/76561198089631701#!/compare/1609372800/1609632000

https://backpack.tf/profiles/76561198257109478#!/compare/1609286400/1609372800

https://backpack.tf/profiles/76561198254882979#!/compare/1602720000/1602806400 - G. Fetti Hazmat + 40 Keys

https://backpack.tf/profiles/76561198089631701#!/compare/1602633600/1602806400 - Added 14 Keys for 4 Unusuals

The second sale can't be used because the only Sack and Buddy sales aren't traceable.

The Hazmat's sales were pretty discrepant at the time, so that sale can be excluded as well.

Can't tell what the sale was here:

https://backpack.tf/profiles/76561198257109478#!/compare/1609632000/1609804800

https://backpack.tf/profiles/76561198336460737#!/compare/1609632000/1609804800

400 flat will work here