Team Fortress 2
Counter-Strike: Global Offensive
Sale 2: https://backpack.tf/profiles/76561198052196602#!/compare/1544486400/1544572800
Not sure, scm doesn't show anything past Christmas
Sale 3: 22k (aussie wrench)
A BMOC was added 5.15 keys classifieds seller.
Sale 4: 20k
Sale 5: 20k again
20-22 seems valid here
20, 20, 22
@Thanks for j58 for helping me out with the suggestion!