Re-suggestion of: https://backpack.tf/suggestion/5ebb8a0bfaed687141187fcd

Sale 1: https://backpack.tf/profiles/76561197973696367#!/compare/1587772800/1587945600 13 keys

Sale 2: https://backpack.tf/profiles/76561198167226845#!/compare/1584835200/1585267200 11 keys

Sale 3: https://backpack.tf/profiles/76561198396959351#!/compare/1585094400/1585267200 10 keys

Sale 4: https://backpack.tf/profiles/76561198047988243#!/compare/1584057600/1584144000 10 keys + 39.22 ref, rounding to 11.

The sales which https://backpack.tf/profiles/76561198071983249 involved weren't included because the comparison is broken, and the transactions he involved happened within a day. (That's why it has a broken comparison.) Therefore untraced.

All sales happened on one single item: https://backpack.tf/item/6278197112