Sale 1: Sold together with 18 keys for Frostbite Chieftain's Challenge

https://backpack.tf/profiles/76561198170114802#!/compare/1496880000/1496966400

https://backpack.tf/profiles/76561198070569251#!/compare/1496707200/1496966400

Was used to price Chieftain: https://backpack.tf/suggestion/593faaf50e2cad26940c94d4

Sale 2: Bulk

https://backpack.tf/profiles/76561198070569251#!/compare/1498176000/1498262400

Sale 3: Sold together with Neutron Star Wing Mann (10) for duped Overclocked Team Captain (52) -> 42

https://backpack.tf/profiles/76561198033378852#!/compare/1498348800/1498435200

Mini Team Captain: Sold for Blizzardy Storm Soldier's Stash (52)

https://backpack.tf/profiles/76561198217456515#!/compare/1495843200/1495929600

Buyer is reselling TC for 50 keys so this mini should work

Sale 4: 33 keys + 20 ref;

https://backpack.tf/profiles/76561198077729561#!/compare/1494028800/1494115200

Sale 5: Sold together with Strange Specialized Killstreak Australium Ambassador (10) for Hot Professional Killstreak Stabbed to Hell Knife Battle Scarred (34) --> 24 keys

Buyer at 33 keys 20 ref http://i.imgur.com/MPrrus4.png --> only 1 sale at 42

Young seller at 35. If the seller at 35 doesn't sell fast this might need a range from 35-42 but for now I'll go with flat 42