Made a small mistake on my last suggestion for this. Apparently the Mancer in Sale 1 was offered on the Jefe, not the other way around, so no overpay was needed.

Sale 1: http://www.tf2outpost.com/trade/25896155 - Offered on a Frostbite Ninja Hood with 4 keys of sweets (http://prntscr.com/76rl7m), so 130-4=126.

Sale 2: http://www.tf2outpost.com/trade/25762240 - Using this one to price the Spellbound YWNM

Sale 3 (OUTLIER): Seller Before: https://backpack.tf/profiles/76561198070143554?time=1429340400

Seller After: https://backpack.tf/profiles/76561198070143554?time=1429469707

No mini needed on the Sensei as it was not outdated at the time of the sale. Mini is needed on the Fruit Shoot as it as outdated by one day at the time of the sale :/

49 (mini value see below) plus 47.5= 96.5 times .9= 86.85, rounding to 87.

Ruling this one an outlier based on the other sales I have here and the offers on this trade ( http://www.tf2outpost.com/trade/25539334 ), one of which is a Massed Flies Cold Killer recently updated at 147 keys.

Sale 4: Buyer Before: https://backpack.tf/profiles/76561198070143554?time=1428822000

Buyer After: https://backpack.tf/profiles/76561198070143554?time=1428908400

Sold for A vintage Alien Swarm Parasite. Parasite mini courtesy of Polar from the last suggestion:

"There's also the sale of the v parasite ~110

Mini on parasite

http://backpack.tf/profiles/76561198103387102?time=1428735600 - secret private eye + pro big kill ~130 keys

http://backpack.tf/profiles/76561198070143554?time=1428822000 - beams phantom + holy grail buy a life ~110?

http://backpack.tf/vote/id/54ed28fcb88d880c618b45a4 - fairly recent sale on private eye at 128 keys pure""

Taking the sale as 110 because I trust Polar.

Fruit Shoot Mini: http://www.tf2outpost.com/trade/25489620 - Sold for an Australium Rocket Launcher and 5 keys.

49 times .9=44.1 plus 5= 49.1, rounding to 49.

Other sales were untraceable or clear outliers.

As usual, if there is anything wrong with this suggestion please tell me and I will try to fix it! Thanks in advance and have a nice day :)