5 month old suggestion, should be updated. A few have sold recently, one will likely sell in the next few days, and there are more starting to be listed. Before you call me out for trying to raise my backpack value, let me state that I honestly don't give two shits about my backpack value. On to the proof.

Recent Sale:

http://www.tf2outpost.com/trade/14895921 Sold to Porridge for 1.5 pure within a week

http://www.tf2outpost.com/trade/14277151 Sold to Vietnam for 22 keys

Offers:

http://www.tf2outpost.com/trade/15331857 (My trade)

-Bubbling whoopee (1.2 buds) + 2/3 keys : ~1.35 buds

-Tf2 logo Pug (12 keys) + SF Grenade (12.5 keys) + sweets (???) : ~24+ keys (1.5 buds)

-Smoking Stout Shako : 1.2 buds

-22 keys Pure

Avg. Offers on my trade : ~1.35 buds; not factoring overpay

http://www.tf2outpost.com/trade/15516434

-15 spooky keys (at 1.2 each) : 1.125 buds

-Smoking Stout Shako : 1.2 buds

Avg. offers on this trade: ~1.16 buds; not factoring overpay

http://www.tf2outpost.com/trade/15588452

B/O of 1.5 pure; no offers yet

http://www.tf2outpost.com/trade/15622841

B/O of 1 - 1.2 buds; offered 12 keys pure by same guy that offered 15 spooky keys on the other trade, was rejected.