Sale 1: (outlier, lower B/Os on market)

Sold with 6 keys for a Disco Beat Down Stainless Pot, a S. Festive Rocket Launcher, and a Disco Beat Down Scotsman's Stove Pipe

(35 + 41 + 22)*0.9 - 6 = 82.2 rounding to 82 keys

http://www.tf2outpost.com/trade/25044519

http://backpack.tf/profiles/76561198055552635?time=1425024000 (February 27th)

http://backpack.tf/profiles/76561198055552635?time=1425196800 (March 1st)

Sale 2:

Sold for 55 keys

55 keys

http://www.tf2outpost.com/trade/25211702

http://backpack.tf/profiles/76561198044037534?time=1427353200 (March 26th)

http://backpack.tf/profiles/76561198044037534?time=1427439600 (March 27th)

Sale 3:

Sold for a Frostbite HWNN

http://www.tf2outpost.com/trade/25729864

Sale will cap at 62 keys from his B/O

Sale 4:

Sold with 22 keys and 7 keys of sweets for a Morning Glory Sergeant's Drill Hat

(90*0.9) - 22 - 7 = 52 keys

http://backpack.tf/profiles/76561198124159344?time=1426143600 (March 12th)

http://backpack.tf/profiles/76561198124159344?time=1426316400 (March 14th)

Notes:

Mini for the Disco Beat Down Stainless Pot: ~41 keys

Sold for a Circling TF Logo Defiant Spartan, 13 keys, and 6 keys of sweets

(13 + 22 + 6) = 41 keys

http://backpack.tf/profiles/76561198066065032?time=1430550000 (May 2nd)

http://backpack.tf/profiles/76561198066065032?time=1430636400 (May 3rd)

Conclusion:

Sales at 52, 55, 62 and an outlier at 82 ,taking the final range at 52 to 62 keys.