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Resuggesting with a range.
Using two recent sales.
Sale #1:
Offered with 2 keys for an Orbiting Planets Tyrant's Helm:
http://www.tf2outpost.com/trade/26617739
Total: 16 - 2 = 14 keys
Sale #2: (Credits to DedAndrei)
Sold for an Orbiting Fire Ye Olde Baker Boy and sweets:
http://prntscr.com/8pciap
Seller's backpack before: http://backpack.tf/profiles/76561198158396145?time=1444287600
Seller's backpack after: http://backpack.tf/profiles/76561198158396145?time=1444201200
Total: 19.5*0.9 = 17.55 keys
17.55 - 0.625 = ~17 keys
Please tell me if I have made a mistake.