I accidentally a free suggestion.

Sold for an Orbiting Planets Pirate Bandana(~17 Keys) and 7 Keys(24 Keys total)(B/O was 23)

http://backpack.tf/profiles/76561198052267968?time=1452326400 (January 9th)

http://backpack.tf/profiles/76561198052267968?time=1452412800 (January 10th)

http://www.tf2outpost.com/trade/27606109

Quicksold For 14 Keys

http://backpack.tf/profiles/76561198017866818?time=1453622400 (January 24th)

http://backpack.tf/profiles/76561198017866818?time=1453708800 (January 25th)

http://www.tf2outpost.com/trade/27756282

Sold with a Green Confetti Thirst Blood(26 Keys) for an Aces High Pyromancer's Mask(43 Keys)(17 Keys total)

http://backpack.tf/profiles/76561198108313456?time=1453708800 (January 25th)

http://backpack.tf/profiles/76561198108313456?time=1453795200 (January 26th)

Using 17.

Only recent sale, 23 Keys should be fine.

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