10 months outdated.

Proof:

Sellers:

http://www.tf2outpost.com/trade/26076528 (60? wow)

http://www.tf2outpost.com/trade/25960590 (45 keys)

Solds:

http://backpack.tf/profiles/76561198019254968?time=1431047461 (compared to day after, sold for 27 (+ the diamondback which sells for about ~ 2 keys) keys in items + 3 keys in pure So 29x0.9= 26 keys + 3 pure = 29.)

http://backpack.tf/profiles/76561198042500556?time=1430572370 (sold with an aussie scatter ~ 35 + aussie axtingusher ~ 8 for a scorching beret ~ outdated but can find mini so ~ 90 keys.. gifted one at 80 keys? But from a famous guy from "Stabby". Not sure if to price at this or 90.... Guess 90 for now so 35+8 = 43. 90-43 = 47x0.9 = 42

http://backpack.tf/profiles/76561198143584321?time=1431001276 (compared to date before sold for a gains party ~ 26 + 4 keys pure (3 in keys, 1 in ref). So thats 26x0.9= 23 + 4 = 27 keys.

http://backpack.tf/profiles/76561198085861958?time=1430650011 (sold with 4 keys in items for a pro ks aussie scattergun with a seller at 42 http://backpack.tf/u/76561198098836810 so thats 42-4 = 38x0.9= 34 keys)

http://backpack.tf/profiles/76561198021270102?time=1431408467 (sold for a blizz storm shako ~ 18 keysx0.9= 16 keys)

http://backpack.tf/profiles/76561198125269275?time=1432652047 (added 4 keys pure for an aussie sniper rifle ~ 34. So 34-4 = 30x0.9 = 27 keys)

http://backpack.tf/profiles/76561198034160789?time=1428457699 (sold with a mega strike deep fried ~ 22 for 60 keys pure. so 44 the screaming would have to be)

Mini needed:

http://backpack.tf/profiles/76561198148353295?time=1429310202 (sold for a stormy storm ol geezer, geezer person added about a key in items. Geezer is outdated but seller for 17, so if we took that seller it would be like 18x0.9? Outlier probs..)

Range because 2 solds at 27, 16 might be a quicksale, sold at 34, the 42 one is probably and outlier and needs a mini, sold at 29, not sure about the 44 key sale tho.