Messed up the calculations for the low end. Thank you Jacobmeister for pointing it out. I must be panicking about my Calculus exam.

Sale 1: Sold for a Sunbeam Capo's Caper (55-57 keys. Taking 56)

http://backpack.tf/profiles/76561198070443280?time=1428649200 (April 10th)

http://backpack.tf/profiles/76561198070443280?time=1428735600 (April 11th)

Hist of Caper: http://backpack.tf/item/1276523054

Hist of Pomade: http://backpack.tf/item/3059920149

56*.9 = ~50 keys

Sale 2: http://www.tf2outpost.com/trade/25191973 - B/O 7 buds

Included with a F. Rocket Launcher (1.5 keys), KS F. Sticky Launcher (1.12 keys), F. Sticky Launcher (10 ref), and painted Sub Zero Suit (15 ref + .95 keys for paint) for a Stormy Storm Killer Exclusive (64-69 keys. Mid is 66.5, so round to 67 keys)

http://backpack.tf/profiles/76561198077998806?time=1425024000 (February 27th)

http://backpack.tf/profiles/76561198077998806?time=1425196800 (March 1st)

Keys were 17.66-18 ref back then.

67 - (1.5 + 1.12 + 1.79 + .83)*0.9 = ~62 keys

Sale 3: Involved in a bulk sale for a Sunbeams Dread Hiding Hood.

http://backpack.tf/profiles/76561198077998806?time=1427785200 (March 31st)

http://backpack.tf/profiles/76561198077998806?time=1427871600 (April 1st)

Sale 4: Involved in a bulk sale for a Searing Plasma Soldier's Stash.

http://backpack.tf/profiles/76561198063007832?time=1428130800 (April 4th)

http://backpack.tf/profiles/76561198063007832?time=1428217200 (April 5th)

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Mini for KS F. Sticky:

2.72 on SCM on Feb. 27

Keys were 2.43 SCM that day

2.72 / 2.43 = ~1.12 keys