Yay, more suggestions I don't have to put effort into

Sold for 9 Keys

http://backpack.tf/profiles/76561198101029063#!/compare/1494288000/1494374400

http://backpack.tf/item/5219129674

Sold for 10 Keys

http://backpack.tf/profiles/76561198048008254#!/compare/1494806400/1494892800

Sold with ~2 Keys in Sweets for an Orbiting Fire Frenchman's Beret(12 Keys)(10 Keys total)

http://backpack.tf/profiles/76561198111524023#!/compare/1494892800/1495152000

Sold for 10 Keys

http://backpack.tf/profiles/76561198061376237#!/compare/1494374400/1494460800

Sold for 10.5 Keys

http://backpack.tf/profiles/76561198155066949#!/compare/1491523200/1491609600

Sold for 8 Keys

http://backpack.tf/profiles/76561198028861763#!/compare/1490054400/1490140800

Sold for 10 Keys

http://backpack.tf/profiles/76561198374715905#!/compare/1492819200/1492905600

Sold for 8 Keys

http://backpack.tf/profiles/76561198093998184#!/compare/1493769600/1494201600

Sold for 9 Keys

http://backpack.tf/profiles/76561198148843171#!/compare/1489795200/1489881600

http://backpack.tf/item/5208169417

Added 1 Key for an Australium Pro KS Frontier Justice(~10.5 Keys)(9.5 Keys total)

http://backpack.tf/profiles/76561198018101085#!/compare/1489968000/1490054400

Sold for 9 Keys

http://backpack.tf/profiles/76561198110019410#!/compare/1493683200/1493769600

9-10.

Credits to Mindacos for finding the proof. All I did was make the actual suggestion.