Ghost Tricks

http://backpack.tf/item/3584387792

Sale 1) Sold for a Disco Beat Down Airdog (20 Keys) + Circling TF Logo Shooter's Sola Topi (13 Keys)

http://backpack.tf/profiles/76561197961172123#!/compare/1495238400/1495324800

20 + 13 = 33 Keys

Airdog Mini

http://imgur.com/a/sNQjV - Taking 20 Keys

http://backpack.tf/item/5211001431

Sale 2) Sold for ~34 Keys of Stranges

http://backpack.tf/profiles/76561198018101085#!/compare/1489449600/1489536000

http://backpack.tf/item/2835499143

Sale 3) Sold for a Bubbling Thirst Blood (13.5 Keys) + 11 Keys + ~3 Keys of Items

http://backpack.tf/profiles/76561198067575136#!/compare/1494115200/1494201600

13.5 + 11 + 3 = 27.5, which rounds to 28 Keys

Thirst Mini

http://backpack.tf/profiles/76561198153806405#!/compare/1496361600/1496448000 - Sold for 12 Keys

http://backpack.tf/profiles/76561198099626801#!/compare/1492732800/1492819200 - Sold for 15 Keys

http://backpack.tf/profiles/76561198060358262#!/compare/1492819200/1492905600 - Sold for 12 Keys + ~1 Key of Metal

Sale 4) Sold for 23 Keys

http://backpack.tf/profiles/76561198043028890#!/compare/1495843200/1496102400

Low Outlier.

http://backpack.tf/item/2747296584

Sale 5) Sold for 30 Keys

http://backpack.tf/profiles/76561198019257028#!/compare/1496188800/1496275200

34 Keys happened a while ago, so I'll count it high since there's a 1 Month Unsold at 28 Keys -> http://imgur.com/a/cSHHT