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Sale 1

Sold for 13 keys. Only 13 keys match.

http://backpack.tf/profiles/76561198052267968#!/compare/1471564800/1471651200 (sort by time)

http://www.tf2outpost.com/trade/28403254 ----- B/O was 13 keys, took ~10 days

=======> 13 keys

======================================================

Sale 2

Sold for a T-Watt Gridiron Guardian

http://backpack.tf/profiles/76561198052267968#!/compare/1470096000/1470182400

http://www.tf2outpost.com/trade/28387427 ----- B/O was 12 keys

Could be used for the Gridiron.

=======> Not using

======================================================

Sale 3

Sold with 3 keys for a T-Watt Hound Dog (15)

http://backpack.tf/profiles/76561198070704045#!/compare/1472515200/1472688000

No Outpost trade.

=======> 15 - 3 = 12 keys

======================================================

Sellers

- http://imgur.com/a/FjxTc ----- 12 keys (young)

Summary

- Sales for 12, 13.

Going with 12-13 keys. Criticism appreciated!