http://www.tf2outpost.com/trade/25683125

Sold with 3 keys for a Strange Pan (8 keys) + Specialized Aussie SL (~17 keys) + O. Planets Doctor's Sack (~10 keys)

http://backpack.tf/profiles/76561198027555808?time=1428908400 (April 13th)

http://backpack.tf/profiles/76561198027555808?time=1428994800 (April 14th)

This sold fairly quick and much lower than the other sale, so I'll take this as an outlier.

((8 + 17 + 10) * 0.9) + 3 = 34.5; rounded to 35 keys

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http://www.tf2outpost.com/trade/25698022

Sold for a Lantern Cosa (57.5 keys) + 4 keys

http://backpack.tf/profiles/76561198027555808?time=1429167600 (April 16th)

http://backpack.tf/profiles/76561198027555808?time=1429254000 (April 17th)

(57.5 * 0.9) + 4 = 55.75; rounded to 56 keys

Other sale involved DBD Slope Scopers and DP VV

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Planets Doctor's Sack: http://backpack.tf/vote/id/55454347b88d88010c8b460f