Damn, I keep making careless mistakes.

Sale 1: Sold for 12 keys

http://www.tf2outpost.com/trade/28019819 sold without a bump

http://backpack.tf/profiles/76561198162427687/#!/compare/1459296000/1459382400

since this was a quicksale, not gonna use this sale.

Sale 2: Sold for Nuts n' Bolts Connoisseur's Cap[11 keys]

http://backpack.tf/profiles/76561198019160123/#!/compare/1458630000/1458802800

Sale 3: Sold for 16 keys

http://backpack.tf/profiles/76561198019160123/#!/compare/1457337600/1457856000

Seller

http://www.tf2outpost.com/trade/28020662 13 keys for 1 day

So I have sales at 11, 12, and 16. Also have a seller at 13. 11 is an outlier due to 12 keys being a quicksale. Making this a range of 13-16 keys.