Sale 1:

http://backpack.tf/profiles/76561198127948336#!/compare/1492819200/1493078400

Sold for 41 keys pure. Took 4 days.

Sale 2:

http://backpack.tf/profiles/76561198115085780#!/compare/1492300800/1493164800

Sold for a Mega Strike Taunt: Flippin' Awesome (50)

Several sellers @ 50 so using 50 flat.

Sale 3:

http://backpack.tf/profiles/76561198194944434#!/compare/1492128000/1492214400

Sold for a Infernal Smoke Taunt: The Box Trot (46) + 2 key skin

= 48

Sale 4:

http://backpack.tf/profiles/76561198300611992#!/compare/1488585600/1492905600

Sent to friend

Sale 5:

http://backpack.tf/profiles/76561198126190606#!/compare/1491264000/1492905600

Sold for 44 keys pure

Sale 6:

http://backpack.tf/profiles/76561198069613225#!/compare/1491782400/1491868800

Using for taunt

Sale 7:

http://backpack.tf/profiles/76561198096078704#!/compare/1493769600/1495238400

Bulk backpack buy?

Sale 8:

http://backpack.tf/profiles/76561198190474742#!/compare/1496534400/1496620800

Sold for 36 keys pure. Sold within a day, looks like a QS.

Sale 9:

http://backpack.tf/profiles/76561198301820537#!/compare/1496016000/1496534400

http://backpack.tf/profiles/76561198190474742#!/compare/1496448000/1496534400

http://backpack.tf/item/5021840622

Sold with ~1 key in sweets for a Strange Specialized Killstreak Australium Rocket Launcher (37)

= 36. Sold within 2 days. Calling it a QS.

Sale 10:

http://backpack.tf/profiles/76561197994697258#!/compare/1496361600/1496448000

Sold for a Death at Dusk Familiar Fez (34) + Strange Professional Killstreak Australium Knife (24)

= 58

http://www.tf2outpost.com/trade/29186721 - B/O 50

Mini:

http://backpack.tf/suggestion/59365645c440457dfd7907cd

Sale 11:

http://backpack.tf/profiles/76561198079413347#!/compare/1494979200/1495065600

Sold with 8 keys pure for a Purple Energy Physician's Protector (62)

= 54

http://www.tf2outpost.com/trade/29183316 - B/O 50

Sale 12:

http://backpack.tf/profiles/76561197998635950#!/compare/1492819200/1492905600

???

Sale 13: Credits Mindacos

https://marketplace.tf/items/30814;5;u109

http://imgur.com/a/gOhxX

Sold for $90

= ~42 keys

Sales:

41

50

48

44

36 - QS

36 - QS

50

50

42

Going with 41 - 50