COUNTER, thanks too Pampick :)

Usable -

http://backpack.tf/profiles/76561198131795034#!/compare/1474329600/1474502400 - Sold with ALOT of sweets for a Stormy Storm Patriot Peak (120 keys) 120 - 40 keys (sweets) = 80 keys.

http://backpack.tf/profiles/76561198097802823#!/compare/1474761600/1474848000 - 105 keys (http://backpack.tf/suggestion/5809e84e83de6b7bae0af555)

http://backpack.tf/profiles/76561198052267968#!/compare/1475193600/1475280000 ~100 keys based of sellers (http://backpack.tf/classifieds?item=Milkman&quality=5&tradable=1&craftable=1&australium=-1&particle=13)

http://backpack.tf/profiles/76561198053848679#!/compare/1477440000/1477526400 - 87 keys

Unusable -

http://backpack.tf/profiles/76561198041750059#!/compare/1473897600/1473984000 - traded 1:1 for a 1 of 1 hat with only 1 sale, and that sale was for bulk ~Unusable. (http://backpack.tf/profiles/76561198131795034#!/compare/1473811200/1473897600 - bulk)

http://backpack.tf/profiles/76561197962185786#!/compare/1473120000/1473206400 - BULK

http://backpack.tf/profiles/76561198085777264#!/compare/1476662400/1476748800 - Weird sales, outdated.

http://backpack.tf/profiles/76561198050494196#!/compare/1474416000/1474502400 - outlier

http://backpack.tf/profiles/76561198050494196#!/compare/1474156800/1474243200 - not sure about this one, seems like ~110 keys??

Aswell as theres 2 sellers at 100 keys

Scrap.tf Bot sells it for 88 keys and has been for a while.

sales at 80, 87, 100, 105

Im going with 80 --> 105 "Thats the range of the usable sales so why not" :)