Sale #1:

http://backpack.tf/profiles/76561198149345069#!/compare/1469923200/1470528000

Sold 1:1 with Stormy 13th Hour Fruit Shoot.

Had BO 50 keys http://www.tf2outpost.com/trade/28338625

X = 49 keys.

Sale #2:

http://backpack.tf/profiles/76561198021206951#!/compare/1468454400/1468627200

Sold with Sunbeams Bonk Leadwear for Scorching Flames Towering Titanium Pillar of Hats.

Will use to update the Pillar.

Sale #3:

http://backpack.tf/profiles/76561198137493465#!/compare/1464825600/1465084800

Sold for Sunbeams Goggles + 1 key.

Had BO 120$ ~ 55 keys at that time http://www.tf2outpost.com/trade/28209903

X ~ 54 keys.

Summary: 49-54 keys.

Notes: There were 2 more recent sales with a marked user involved. One of those deals was used in the last suggestion (the one with Rebel+Snaggle), but I didnt mention them. Anyway they are close enough with my suggested range.

#lovelogo