Sold for Cloud 9 Buckaroos Hat (23) + Cloud 9 Janissary Ketche (21) + Cloud 9 Plumber's Pipe (12):

http://www.tf2outpost.com/trade/25159998

http://backpack.tf/profiles/76561198104774897?time=1424851200 (February 25th)

http://backpack.tf/profiles/76561198104774897?time=1425715200 (March 7th)

Buyout of 34 keys

Sold with ~1 key for Searing Plasma Grimm Hatte (31):

http://backpack.tf/profiles/76561198046662310?time=1423987200 (February 15th)

http://backpack.tf/profiles/76561198046662310?time=1424505600 (February 21st)

31 - 1 = 30 keys

Presumably offered. Searing Grimm was not outdated at the time. Sale is almost outdated, but this sale provides more confidence to the price. Estimation here should be close.

Bulk sale:

http://backpack.tf/profiles/76561198045303650?time=1430031600 (April 26th)

http://backpack.tf/profiles/76561198045303650?time=1430204400 (April 28th)