http://www.tf2outpost.com/trade/25672023

Sold for 1 bud (~5.5 keys) + 4 keys

http://backpack.tf/profiles/76561198112593468?time=1428822000 (April 12th)

http://backpack.tf/profiles/76561198112593468?time=1428908400 (April 13th)

5.5 + 4 = 9.5; rounded to 10 keys (seller sold the buds for 6 keys so this should be okay)

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Sold for an Australium Blutsauger (10.5 keys)

http://backpack.tf/profiles/76561198150937433?time=1428735600 (April 11th)

http://backpack.tf/profiles/76561198150937433?time=1429340400 (April 18th)

Taking the Blutsauger at the low-end ~10 keys

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Sold for 7 keys

http://backpack.tf/profiles/76561198149031619?time=1429599600 (April 21st)

http://backpack.tf/profiles/76561198149031619?time=1429686000 (April 22nd)

Australium Blutsauger: http://backpack.tf/vote/id/5542cb58b88d88274c8b4582 (needed a range for a while :P)