Sale 1:

Sold for 130 keys

http://www.tf2outpost.com/trade/28509432 - No B/O

Seller: http://backpack.tf/profiles/76561198026577539#!/compare/1475366400/1475625600

Buyer: http://backpack.tf/profiles/76561198007858078#!/compare/1475452800/1475539200

X = 130

Sale 2:

Sold for 115 keys

http://www.tf2outpost.com/trade/28246723 - B/O of 115

Seller: http://backpack.tf/profiles/76561198072168755#!/compare/1470960000/1471910400

Buyer: http://backpack.tf/profiles/76561198038945235#!/compare/1471910400/1472083200

X = 115

Sale 3:

Sold for Poisoned Shadows Desert Marauder + Darkblaze Bonk Leadwear + 33 keys in less than a day

http://www.tf2outpost.com/trade/28451877 - B/O of 101

Seller: http://backpack.tf/profiles/76561198200570945#!/compare/1472342400/1472428800

Buyer: http://backpack.tf/profiles/76561198026577539#!/compare/1472342400/1472428800

Going to exclude this sale simply because it sold in less than a day for much more than the B/O.

Sale 4:

Sold with Pro. KS Aussie Scattergun (35) + Pro. KS Maul (2) for Ancient Eldrich Flame Prehistoric Pullover

Seller: http://backpack.tf/profiles/76561198137131429#!/compare/1476403200/1476489600

Buyer: http://backpack.tf/profiles/76561198043936328#!/compare/1476403200/1476489600

Would be better to update the Pullover with this sale

Sellers:

140 keys:

http://www.tf2outpost.com/trade/28562329

http://i.imgur.com/Qcf5USO.png - 11 days

http://backpack.tf/u/76561198043936328

Sales at:

130

115

101

Sale at 101 sold in less than a day. Excluding 101.

Going with 115-130