http://backpack.tf/item/3624115389

Sale 1:

Offered on a presidends charmers (~27)

http://backpack.tf/profiles/76561198134811927?time=1428100863 before

http://backpack.tf/profiles/76561198134811927?time=1428130800 after

Buyer confirmed it was offered [Thanks Slocumruls]

-> 27 keys

Sale 2:

Gifted DaD raincatcher (?)

http://backpack.tf/profiles/76561198065057392?time=1427846448

http://backpack.tf/profiles/76561198065057392?time=1428044400

Mini on the raincatcher:

Looks like it was sold with an Ooze Engineer's Cap and a V. Lugermorph for a Frostbite Kabuto and a Stormy Storm Bomber.

http://backpack.tf/profiles/76561198150079125?time=1428476400 (April 8th)

http://backpack.tf/profiles/76561198150079125?time=1428562800 (April 9th)

[Credits to Mage Kid]

This would require pricing of the FB kabuto and the ooze engi cap (I can work on that, but as for now, I think its best to exclude this sale)

Sale 3:

Sold for a bud (8) + 2 keys + a few ref

http://imgur.com/xTuaqaD

8+2 = 10 keys

http://backpack.tf/item/2842449794

Sale 4:

Sold for 38 pure

http://www.tf2outpost.com/trade/24909666

http://backpack.tf/profiles/76561198090829296?time=1426184153 before

http://backpack.tf/profiles/76561198090829296?time=1426662000 after

38 keys match the offerer on outpost

-> 38 keys

History reveals it was exchanged after that (since the offerer doesnt match the current owner)

However, no return is shown (plus theres a huge gap)

http://backpack.tf/profiles/76561198123810241?time=1426143600 before

http://backpack.tf/profiles/76561198123810241?time=1429340400 after

It did not instantly appear after it disappears, which suggests a SCM sale.

Considering the sales, 10 seems to be the low outlier

Suggested value: 27-38

*help from Foamy the Fearsome