33 Keys for this. What.

Sold with a Miami Nights Virus Doctor(18 Keys with Overpay) for an Australium Sniper Rifle(32 Keys with Overpay at the time)(14 Keys total)

http://backpack.tf/profiles/76561198081421112?time=1431759600 -> http://backpack.tf/profiles/76561198081421112?time=1431846000

Sold for a Miami Nights Chieftain's Challenge(21 Keys with Overpay, Outlier)

http://backpack.tf/profiles/76561198067027056?time=1431586800 -> http://backpack.tf/profiles/76561198067027056?time=1431759600

Sold for an Aces High Conquistador(14 Keys with Overpay)

http://backpack.tf/profiles/76561198067027056?time=1431806719 -> http://backpack.tf/profiles/76561198067027056?time=1431846000

21 Seems high(And apparently, the buyer regretted his sale lol: http://www.tf2outpost.com/trade/25971113 ). 14 Keys should be fine.

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