Sale 1:

Sold for Bubbling Larrikin Robin (10) + >2 keys in items (starduster was added, found in buyer’s compare link)

http://www.tf2outpost.com/trade/28849713 - B/O of 12

Seller: http://backpack.tf/profiles/76561198159855421#!/compare/1491264000/1491350400

Buyer: http://backpack.tf/profiles/76561198118607843#!/compare/1491350400/1493337600

X = 12 (Capped by B/O)

Sale 2:

Sold with Nuts n Bolts Master’s Yellow Belt for Purple Confetti Stainless Pot

Seller: http://backpack.tf/profiles/76561198118607843#!/compare/1495152000/1495929600

Buyer: http://backpack.tf/profiles/76561198006544512#!/compare/1495411200/1495670400

This is close to, like, 2 keys.

Sellers:

11 keys:

http://i.imgur.com/Mw3A0X2.png - 22 days

http://backpack.tf/u/76561198006544512

Sales at:

12

Aged seller at 11.

Going with 11-12.