Sold for Steaming Pencil Pusher (22) + Strange Original (5):

http://backpack.tf/profiles/76561198112599420?time=1426316400 (March 14th)

http://backpack.tf/profiles/76561198112599420?time=1426402800 (March 15th)

(22 + 5) * .9 = 24.3 keys

Rounded to 24 keys

Sold for Vivid Plasma Grenadier's Softcap (40):

http://backpack.tf/profiles/76561198165756629?time=1426057200 (March 11th)

http://backpack.tf/profiles/76561198165756629?time=1426143600 (March 12th)

40 * .9 = 36 keys

Sold for Miami Nights Tyrant's Helm (26) (duped sale):

http://backpack.tf/profiles/76561198123494932?time=1428130800 (April 4th)

http://backpack.tf/profiles/76561198123494932?time=1428217200 (April 5th)

26 keys

Miami Tyrant might be a bit higher than 26 keys, but this should fit in range and estimation should be close.

Unsold at 50 keys for 2 months:

http://www.tf2outpost.com/trade/25045760

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Miami Nights Tyrant's Helm:

Using 26 keys.