Bit high for a robo hat.

Sold for 6 Keys and a Lime Bill's Hat(3 Keys at the time)(9 Keys total)

http://backpack.tf/profiles/76561198092480015?time=1427835375 -> http://backpack.tf/profiles/76561198092480015?time=1427871600

Sold for a Strange Machina(~10.5 Keys with Overpay)(B/O was 10)

http://backpack.tf/profiles/76561198049546932?time=1428044400 -> http://backpack.tf/profiles/76561198049546932?time=1428130800

http://www.tf2outpost.com/trade/25557219

Sold for 1 Bud(5 Keys at the time), a Black Bill's(~3 Keys at the time) and ~1.5 Keys in Sweets(~9.5 Keys total)

http://backpack.tf/profiles/76561198068200165?time=1430533365 -> http://backpack.tf/profiles/76561198068200165?time=1430550000

Sales seem to fit, 9-10 Keys should be fine.

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