Sale 1:

Sold for Miami Nights Waxy Wayfinder + ~11 keys in items

http://www.tf2outpost.com/trade/27491782

http://backpack.tf/profiles/76561198142589602?time=1448524800&compare=1448611200

X = (12.5 + 11)0.9

X = 21 keys

Mini on Wayfinder:

♥Prof. Sugarcube™♥'s suggestion: http://backpack.tf/vote/id/56524d55b98d88a875e94aec

Sale 2:

Sold for Terror-Watt Minnesota + Collector's Killstreak Homewrecker

http://www.tf2outpost.com/trade/27455381

http://backpack.tf/profiles/76561198068090261?time=1448179200&compare=1448352000

X = (17 + 3)0.9

X = 18 keys

Sale 3: Not using

Sold with 4 keys + 1 key in items for DBD Hound Dog

http://www.tf2outpost.com/trade/27432623

http://backpack.tf/profiles/76561198068090261?time=1447574400&compare=1448006400

http://backpack.tf/profiles/76561198095752814?time=1447920000&compare=1447833600

Would be more necessary to use this sale to update the Hound Dog

Sale 4: Not using

Bulk sale, it seems.

http://www.tf2outpost.com/trade/27415928

http://backpack.tf/profiles/76561198085899875?time=1447574400&compare=1447660800

Going with 18-21 keys