2 years old price. Time for an update. This time with correct range!

Sale 1: Sold together with Dead Presidents Dead Cone (11.5) for Stormy Storm A Hat to Kill For (25.5) --> 14 keys

http://backpack.tf/profiles/76561198313018251#!/compare/1493856000/1494028800

Mini Dead Cone: Sold together with 1 key for Circling Peace Sign Pugilist's Protector (12.5) --> 11.5 keys; rounding to 12 keys.

http://backpack.tf/profiles/76561198087106385#!/compare/1494374400/1494633600

Mini Hat to kill for: Sold for Dead Cone for Stormy Storm (11.5) + 14 keys --> 25.5

http://backpack.tf/profiles/76561198313018251#!/compare/1492819200/1492905600

Sale 2: 14.5 keys pure --> 15 keys

http://backpack.tf/profiles/76561198241107714#!/compare/1493856000/1493942400

Sale 3 (dupe): 16 keys pure (compare link shows 19 keys but I checked them and on 3 of the keys I did not find the seller's name)

http://backpack.tf/profiles/76561197988298015#!/compare/1490140800/1491091200

--> Suggesting range from 15-16 keys; with 2 pure sales it is enough to use those as range. Thanks to Foamy for his feedback on my previous suggestion.