There's a pun here somewhere, I'm certain of it.

Sold with ~1 Key in Sweets for a Bubbling Noble Amassment of Hats(18.5 Keys, round to 19) and a Cool Woodsy Widowmaker SMG(Well-Worn)(13 Keys)(32 Keys total)

http://backpack.tf/profiles/76561198338556449#!/compare/1482969600/1483056000

http://backpack.tf/profiles/76561198162197381#!/compare/1482969600/1483056000

Sold for a Disco Beat Down Tartan Tyrolean(25.5 Keys, round to 26) and 1 Key(27 Keys total)

http://backpack.tf/profiles/76561198162197381#!/compare/1483056000/1483142400

Sold for a Bubbling Company Man(20 Keys) and 8 Keys(28 Keys total)

http://backpack.tf/profiles/76561198066195760#!/compare/1484092800/1484179200

Sold or a Disco Beat Down Tartan Tyrolean(25.5 Keys, round to 26)

http://backpack.tf/profiles/76561198192602363#!/compare/1484352000/1484438400

Sold for 30 Keys

http://backpack.tf/profiles/76561198074866037#!/compare/1484524800/1486425600

26-32.

Credits to Mindacos for the suggestion. He found the proof, I'm just posting it.