Sold with 115 keys for Holy Grail Taunt: The Meet the Medic:

http://backpack.tf/profiles/76561198077454234?time=1443855600

http://backpack.tf/profiles/76561198077454234?time=1443942000

http://backpack.tf/profiles/76561198077454234?time=1443942000&compare=1443855600

Quicksold for 30 keys?

http://www.tf2outpost.com/trade/27189446

http://backpack.tf/profiles/76561197965601027?time=1444114800

http://backpack.tf/profiles/76561197965601027?time=1444287600

http://backpack.tf/profiles/76561197965601027?time=1444287600&compare=1444114800

Incorrect key histories

Sold for Frostbite Dragonborn Helmet:

http://www.tf2outpost.com/trade/27176913

http://backpack.tf/profiles/76561198080436316?time=1444114800

http://backpack.tf/profiles/76561198080436316?time=1444201200

http://backpack.tf/profiles/76561198080436316?time=1444114800&compare=1444201200

Buyout of 35 keys

Sold for Circling TF Logo Surgeon's Shako Circling TF Logo Surgeon's Shako (33) + Strange Snack Attack (3.7):

http://backpack.tf/profiles/76561198027062821?time=1443769200

http://backpack.tf/profiles/76561198027062821?time=1443855600

http://backpack.tf/profiles/76561198027062821?time=1443855600&compare=1443769200

http://backpack.tf/profiles/76561198080436316?time=1443423600

http://backpack.tf/profiles/76561198080436316?time=1443855600

http://backpack.tf/profiles/76561198080436316?time=1443423600&compare=1443855600

33 + 4 = 37 keys

Sold with Strange Specialized Killstreak Australium SMG + Strange Killstreak King of the Jungle Minigun + 3 keys for Circling Peace Sign Master's Yellow Belt:

http://backpack.tf/profiles/76561198092369402?time=1443855600

http://backpack.tf/profiles/76561198092369402?time=1443942000

http://backpack.tf/profiles/76561198092369402?time=1443942000&compare=1443855600

Peace Yellow Belt has sellers at around 35, which would result this sale to be ~20.

Sold with Aces High Cold Killer for Haunted Phantasm Jr Nanobalaclava:

http://backpack.tf/profiles/76561198172201851?time=1445497200

http://backpack.tf/profiles/76561198172201851?time=1445583600

http://backpack.tf/profiles/76561198172201851?time=1445497200&compare=1445583600

Can't find usable sales for the Nano.

Sold for Miami Nights Vintage Merryweather (21) + Strange Professional Killstreak Rocket Launcher (12) + Professional Killstreak Big Kill (8) + Collector's Eviction Notice (1.5):

http://www.tf2outpost.com/trade/26997734

https://i.gyazo.com/19bef4eb0b70199d405074c3090610e5.png

(21 + 12 + 8 + 1.5) * .9 = 38.25

~38 keys

The previous owner quicksold to me (for 26 keys, iirc).

Quicksold for 26 keys?

http://www.tf2outpost.com/trade/27330946

Offered 33 keys:

http://www.tf2outpost.com/trade/27296626

Including this in range as the owner would sell for 33 keys

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Frostbite Dragonborn Helmet:

http://www.tf2outpost.com/trade/27093033