2+ year old price, resuggesting since Cashew pointed out some keys I missed.

Sold alongside 5 keys for Miami Nights Nibble (~29 keys see http://backpack.tf/vote/id/5532d39bba8d8894448b6031 ) + Anti-Freeze Little Buddy (~63 keys) = ~87 keys

http://www.tf2outpost.com/trade/25695273

http://backpack.tf/profiles/76561198046964317?time=1429254000&compare=1429340400

Sold for two Miami Nights Brainiacs (~32 keys) - ~62 keys, B/O of 60, sold in a couple days

http://www.tf2outpost.com/trade/25457942

http://backpack.tf/profiles/76561198070459287?time=1427180400

Sold for 65 keys in 3 days (relisted)

http://www.tf2outpost.com/trade/25341488

http://backpack.tf/profiles/76561198070459287?time=1425970800

Sold in a day for 50 keys

http://www.tf2outpost.com/trade/25443388

http://backpack.tf/profiles/76561198080310253?time=1426921200

The 60- key sales all sold fairly quickly, just going to go with the higher sale