Raise your pigs.

Sale #1 (February 28th):

http://www.tf2outpost.com/trade/27857177 Sold for 300 keys

Sale #2 (February 16th):

http://www.tf2outpost.com/trade/27849377

The buyer was nice enough to provide a screenshot of this trade. ( thanks to mmmcheezburger - http://steamcommunity.com/profiles/76561198051032766 )

http://i.imgur.com/KYnPn8L.png

http://backpack.tf/profiles/76561198051032766/#!/compare/1455523200/1455609600

http://backpack.tf/profiles/76561198046453101/#!/compare/1455523200/1455609600

Sold for:

12 keys

Duped Peace Pyromancer's Mask (73.5)

Sunbeams Scotch Bonnet (49)

Steaming Rebel Rouser (22)

Stormy Storm Scotch Bonnet (14)

Cloud 9 Valhalla Helm (52)

Warhawk Grenade Launcher (Minimal Wear) (1)

Red Bear Shotgun (Minimal Wear) (2)

Strange Specialized Killstreak Frying Pan (~9)

All together now...

12 + 73.5 + 49 + 22 + 14 + 52 + 1 + 2 + 9 = 234.5 keys, rounded to 235 keys

The seller was selling this for about 2 days.

Duped Peace Pyromancer's Mask

http://www.tf2outpost.com/trade/27984670 Sold for 77 keys

http://www.tf2outpost.com/trade/27891244 Seller at 70 keys for ~1 month

Value here should be around ~70-77 keys.

73.5 keys

Steaming Rebel Rouser

https://backpack.tf/profiles/76561198137148352/#!/compare/1456214400/1456473600 Smoking Armored (15) + 7 keys (~22 keys)

Red Bear Shotgun (Minimal Wear)

http://steamcommunity.com/market/listings/440/Red%20Bear%20Shotgun%20(Minimal%20Wear)

~$5, ~2 keys

Warhawk Grenade Launcher (Minimal Wear)

http://steamcommunity.com/market/listings/440/Warhawk%20Grenade%20Launcher%20%28Minimal%20Wear%29

~$3, ~1 key

Cloud 9 Valhalla Helm

https://backpack.tf/profiles/76561198162120088/#!/compare/1455177600/1455264000

Sold with Steaming Rebel Rouser (22) for a Strange Factory New Balloonicorn Rifle (~50)

http://steamcommunity.com/market/listings/440/Strange%20Balloonicorn%20Sniper%20Rifle%20%28Factory%20New%29 Rifle sells around ~$100-$150 on average.

That would put the Valhalla at around 30 keys, but that just seems too low. Other recent sales seem to bulk. I suppose the old value would be close enough? I wouldn't doubt DedAndrei could sell this for around 52 keys.

52 keys

Conclusion

Two recent sales at 235 and 300 keys. 300 keys is the most recent, and it's in full pure. The 235 sale occurred in 2 days, meaning the seller may not have given the Pig enough time to collect better offers. Given this data, I propose a price at 300 keys flat.