Oh well...

Sale #1 :

http://puu.sh/oBA4I/3871c08ee6.png - whole trade

https://scr.hu/J8zB7j - Pro KS Shotty

https://scr.hu/1rXmwj - Bonk Boy

https://scr.hu/gyBK40 - Death Racer's Helmet

Sold for It's a Mystery to Everyone Death Racer's Helmet (outdated) + Pro KS Shotty + 20 keys

70 + 20 + 7 = 97 keys, capped by 80 keys B/O. (if I'd take the 61 keys value off the Racer, it'd cap at 80 anyways)

The trade : http://www.tf2outpost.com/trade/28003946

Death Racer's Helmet Mini :

http://backpack.tf/profiles/76561198085116555#!/compare/1460505600/1460592000

Death Racer's Helmet + 36 keys + Pro KS Shotgun + ~4 keys of sweets FOR Blizzardy Storm Boxcar Bomber [120]

120 - 36 - 7 - 4 = 73 keys, capped to 70 keys B/O.

The 70 keys B/O trade : http://www.tf2outpost.com/trade/28057514

Pro KS Shotgun mini :

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Festive%20Shotgun

Sales in the last week (in Euro) : 12.28 , 15.61, 16.09, 18.36, 19.85, 21.92, 24.54, 24.55, after adding all , it's 144.2 / 8 = 18.02 Euro average

18.02 Euro is 15.77 Euro after taxes. 15.77 / 2.22 = 7.1 keys, rounding to 7 keys

Sale #2 :

Sold for a Searing Plasma Beak [80] :

https://scr.hu/A5zMkk - Beak

https://scr.hu/3m63e1 - Bonk

80 keys

Both solds are 80 keys, so I'll take 80 keys as it's value.

Couldn't find any other sales, so if you find one, please inform me :3