decided to make a nicer suggestion (again) a young skipper helped me out with some proof! ^_^

sold for a MN bolted bird cage:

http://backpack.tf/item/2365939464 <--- hat history of the birdcage

http://backpack.tf/item/3319704614 <--- hat history of the bone dome

--- dates of last seen are both 1 day off, also it says unkown item, but if you check their outposts you can see he owned it

http://www.tf2outpost.com/trade/25731052

and

http://www.tf2outpost.com/trade/25699769

--- also both trades closed 1 day apart, "ironically"

11 x .9 = 9.9, rounding to 10 keys

sold for 1 bud pure

http://imgur.com/a/SX4Qf

http://www.tf2outpost.com/trade/25205315

--- buds were indeed 12 keys at the time, considered a pure sale (for being back in da day)

special thanks to:

[F2P] Ace - helped me with dat pure sale

the most recent sale for the 1st sale proof is all jumbled up from hyper-trading. also i havent found a single for this at 15 keys at all, even outdated sales, just a side note rlly ^_^ im guessing this one sold for around 10 keys as well http://www.tf2outpost.com/trade/25734262 (says that was his b/o in trade) and he now owns 9 untradeable keys, im assuming he spent one somehow, not going to use as proof, but more as supportive proof of this accurate price.

better than my 8 key price suggestion lol, even though the both sold for that :p