http://www.tf2outpost.com/trade/25939004

Sold for 55 keys

http://backpack.tf/profiles/76561198052803733?time=1431586800 (May 14th)

http://backpack.tf/profiles/76561198052803733?time=1431673200 (May 15th)

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http://www.tf2outpost.com/trade/25585034

Sold with a Smoking Drill Hat (outdated) for a duped Cloudy Moon Brain Bucket + 6 keys + ~1.2 keys in items

Seller:

http://backpack.tf/profiles/76561198048770245?time=1430550000 (May 2nd)

http://backpack.tf/profiles/76561198048770245?time=1430636400 (May 3rd)

Buyer:

http://backpack.tf/profiles/76561198052803733?time=1430463600 (May 1st)

http://backpack.tf/profiles/76561198052803733?time=1430550000 (May 2nd)

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http://www.tf2outpost.com/trade/25402917

Quick-sold for 4 buds ~40 keys at the time

http://backpack.tf/profiles/76561197978915028?time=1426575600 (March 17th)

http://backpack.tf/profiles/76561197978915028?time=1426662000 (March 18th)

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Complex sale for Searing Mohawk

http://backpack.tf/profiles/76561198120467518?time=1428562800 (April 9th)

http://backpack.tf/profiles/76561198120467518?time=1428649200 (April 10th)

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Sellers:

http://www.tf2outpost.com/trade/25659582 55 keys, was offered Scorching Topi (42.5) + 3 buds (12)

Since 55 keys is the most recent sale which didn't take too long to sell, the lower sale for 4 buds should be left out. The other seller at 55 keys supports the value as well.