Lets start off with my second suggestion (first one failed)

There were 2 on the market but I bought one (http://www.tf2outpost.com/trade/24192802) and now there is 1.

Sellers: There was no B/O They were only open to offers.

I bought 1 for: 2 keys + a Strange black box and a scrap (he wanted me to add)

http://gyazo.com/7769b1ec58d4e920aebb95b8932db693

Thats a little bit above roughly 2,4 keys

Another guy offered on this guy's trade:

http://www.tf2outpost.com/trade/24034713

3 keys, If he of course removed the name tag.

that offer. Was declined.

Would have more proof, But there are only about 2 on the market. I just bought one so 1 on the market.

Constructive critiscism (sorry if I spelt that wrong) is always welcome :)

☁Merry Christmas from Edwin☁