Counter, had plenty of time to re-suggest.

All credit to Foamy and Shablol

Sale 1:

Sold for 15 keys

http://imgur.com/bmvsmi8

http://backpack.tf/profiles/76561198047182054?time=1449734400

Sale 2:

Sold for a Strange Pro KS Original (12)

Likely offered, no overpay.

http://backpack.tf/profiles/76561198123921731?time=1448870400&compare=1448956800

Sale 3:

Sold with a key for a Smoking Fro (13)

Likely offered, no overpay.

13 - 1 = 12 keys

http://backpack.tf/profiles/76561198123921731?time=1448611200&compare=1448697600

Sale 4:

Sold for around 14 keys in items

14 * 0.9 = 12.6 = 13 keys

http://backpack.tf/profiles/76561198135620995?time=1447056000&compare=1447315200

Sale 5:

Sold for a Planets Waxy Wayfinder (14)

Valuing at 14 keys

http://backpack.tf/profiles/76561198047182054?time=1448870400&compare=1448956800

Wayfinder mini:

Sold 1:1 for a C9 Bombing Run (15)

15 * 0.9 = 13.5 = 14 keys

http://backpack.tf/profiles/76561198055582505?time=1447920000&compare=1448352000

Current B/O at 14 as well: http://www.tf2outpost.com/trade/27412189

Additional sales, unusable:

http://backpack.tf/profiles/76561198190224410?time=1447574400&compare=1448265600

Seems to have been exchanged through Sweepstakes.

http://backpack.tf/profiles/76561198151000235?time=1448870400&compare=1448956800

Bulk item sale for an Aussie Medigun