Sold with ~1 key in items for Strange Specialized Killstreak Australium Force-A-Nature (13) + Non-Craftable Professional Killstreak Tide Turner Kit (4):

http://backpack.tf/profiles/76561198074572145?time=1436511600 (July 10th)

http://backpack.tf/profiles/76561198074572145?time=1436598000 (July 11th)

http://backpack.tf/profiles/76561198074572145?time=1436511600&compare=1436598000

(13 + 4) * .9 - 1 = 14.3 keys

~14 keys

Sold for Searing Plasma Pugilist's Protector (14) + 4 keys:

http://backpack.tf/profiles/76561198009583740?time=1434265200 (June 14th)

http://backpack.tf/profiles/76561198009583740?time=1434870000 (June 21st)

http://backpack.tf/profiles/76561198009583740?time=1434265200&compare=1434870000

14 * .9 + 4 = 16.6 keys

~17 keys

Bulk sale:

http://backpack.tf/profiles/76561198074572145?time=1436684400 (July 12th)

http://backpack.tf/profiles/76561198074572145?time=1436770800 (July 13th)

Sold for gifted Stormy Storm Napper's Respite (19):

http://www.tf2outpost.com/trade/26589840

http://backpack.tf/profiles/76561198126571115?time=1437807600 (July 25th)

http://backpack.tf/profiles/76561198126571115?time=1437894000 (July 26th)

http://backpack.tf/profiles/76561198126571115?time=1437807600&compare=1437894000

Should be ~15-16 keys after gifted overpay. Close enough.