3rd time's a charm, I THINK I ACTUALLY GOT IT RIGHT THIS TIME

Cred to Shuffle Spy for helping me find a lot of the mini's

Sale 1: Sold with a Prof KS Blood Mk1 Botkiller Rocket Launcher (14 Keys) for a Misty Skull Napper's Nespite (74 Keys) + Hot Prof KS Turbine Torcher WW (26 Keys)

https://backpack.tf/profiles/76561198147380643#!/compare/1496016000/1496448000 Seller's Backpack - 86 Keys

Napper's mini

1) Sold for Nether Trail Death Racer's (66 Keys) + Killstreak Big Kill (6 Keys)

https://backpack.tf/profiles/76561198141161482#!/compare/1500681600/1500940800 - 72 Key

2) Sold with Max's Head (17 Keys) for a Haunted Ghosts Coldsnap Cap (90 Keys)

https://backpack.tf/profiles/76561198141161482#!/compare/1500940800/1501027200 - 73 Keys

3) Sold for Strange Starstorm Insomnia Hat With No Name (51.5 Keys) + Aussi Flame Thrower (14 Keys) + 10 Keys

https://backpack.tf/profiles/76561198072733346#!/compare/1501200000/1501286400 - 76 Keys

4) Sold for Haunted Ghosts Private Eye (32 Keys) + Kill-A-Watt Letch's (12 Keys) + Stormy Elfin (10.5 Keys) + 5 Keys + ~1.7 Keys in items

https://backpack.tf/profiles/76561198042599905#!/compare/1494460800/1494633600 - 61 Keys

5) Sold for Green Energy Napper's (48 Keys)

https://backpack.tf/profiles/76561198147380643#!/compare/1496448000/1496620800 - 48 Keys

48, 61, 72, 73, 76

Making that 72-76

Botkiller mini

http://imgur.com/a/m0uG9 - 14 keys

SCM - 2 recent sales at 29.2 and 30.72 euros rounding to 30 euros. Key price in euro @ 2.16 30/2.16~14 Keys

14 Keys

HWNN Micro

1) Sold for Circling Heart Officer's Ushanka (30 Keys) + Dupe Haunted Ghosts Tippler (~20 Keys)

https://backpack.tf/profiles/76561197964171516#!/compare/1497657600/1497744000 -

2) Sold for 37 Keys pure

https://backpack.tf/profiles/76561198182323073#!/compare/1500595200/1500940800

3) Sold for TF Logo Rotation Sensation (48 Keys)

https://backpack.tf/profiles/76561198314349856#!/compare/1500768000/1500854400

4) Bulk for Scorching Noble ~55 Keys

https://backpack.tf/profiles/76561198156255538#!/compare/1501632000/1501718400

37, 48, 50 55

37 Keys is too low

The average would be ~51.5 Keys

Sale 2: Sold for Duped Roboactive Pith Helm (41 Keys) + Spec KS Aussi Rocket Launcher (34 keys)

https://backpack.tf/profiles/76561198011321852#!/compare/1499126400/1499212800 Seller's backpack - 75 Keys

https://backpack.tf/profiles/76561198056414119#!/compare/1499126400/1499212800 Buyer's backpack

http://imgur.com/a/2T698

Duped Pith Helm mini

Sold for Demonflame Capotain (38 Keys) + 3 Keys

https://backpack.tf/profiles/76561198166763414#!/compare/1498262400/1498348800 - 41 Keys

Sold + 5 Keys for Duped Disco Beatdown Coldsnap Cap

https://backpack.tf/profiles/76561198338556449#!/compare/1495324800/1495411200 - 68 Keys

http://imgur.com/a/W2LSt

Colsnap Cap Micro

https://backpack.tf/profiles/76561198129241486#!/compare/1492992000/1493164800 - 73 Keys

The 68 Key sale is too high here since dupe sellers are looking for 45 Keys

http://imgur.com/a/T8mEQ

Capotain Micro

https://backpack.tf/suggestion/595bbd5bcf6c751c191c442a

Aussi Rocket Launcher mini

http://imgur.com/a/Tun7o - 34 Keys

Sale 3: Sold + 10 Keys for a Purple Energy Tyrant's Helm (85 Keys)

https://backpack.tf/profiles/76561198056414119#!/compare/1501545600/1501632000 Seller's Backpack - 75 Keys

https://backpack.tf/profiles/76561198163266519#!/compare/1501545600/1501632000 Buyer's Backpack

http://imgur.com/a/Rna0G

http://i.imgur.com/56KuxSL.png

Tyrant mini

https://backpack.tf/suggestion/5957f5b8cf6c754d7e52ef7e - 85 keys

Sale 4 & 5

Quickbought by Batman for 44 Keys pure, Wow. https://backpack.tf/profiles/76561198349886701#!/compare/1501891200/1501977600

Quickbought by me for 51 Keys pure. https://backpack.tf/profiles/76561198114604882#!/compare/1502064000/1502150400

Phew

So to summarize there are 3 sales, 75 Keys, 75 Keys[b/] and [b]86 Keys

Going with 75 Keys flat