Technically Outdated. The sales used to update it are now.

http://backpack.tf/item/485530640

Sale 1) Sold for a Sunbeams Fruit Shoot (60 Keys) + Max's Severed Head (23 Keys) + ~13 Keys of Items

http://backpack.tf/profiles/76561198082294224#!/compare/1465776000/1466035200

60 + 23 + 13 = 96 Keys

Fruit Shoot Mini

http://backpack.tf/suggestion/5767492d86674724f71a9425 - asked foamy, he said to use 60 since 80 is high and 40 is low. (also, 60's the median there)

Extra Justification for Drop: http://www.tf2outpost.com/trade/28093253 - Went Unsold for 2 Months with a Buyout of 110 Keys