Another one.

Sold for a Circling Peace Sign Napper's Respite(23.5 Keys, rounding to 24)

http://backpack.tf/profiles/76561198034095893/#!/compare/1454486400/1454572800

Sold for a Miami Nights Sober Stuntman(17.5 Keys) and ~2.5 Keys in Sweets(at the time)(20 Keys total)

http://backpack.tf/profiles/76561198177129079/#!/compare/1454745600/1454918400

Sold for a Strange Captain Cardbeard Cutthroat(15 Keys at the time) and 5 Keys(20 Keys total)

http://backpack.tf/profiles/76561198141830968/#!/compare/1453708800/1453795200

Sold for an Orbiting Planets Liquidator's Lid(21.5 Keys) and ~2.5 Keys in Sweets(24 Keys total)

http://backpack.tf/profiles/76561198156615231/#!/compare/1453881600/1454054400

Sales seem to fit, 20-24 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.