Sale 1:

Sold with ~4 keys in items for Max’s Head (~18 at the time)

No outpost

Seller: https://backpack.tf/profiles/76561198164622774#!/compare/1508371200/1508457600

Buyer: https://backpack.tf/profiles/76561198304661367#!/compare/1508371200/1508457600

X = 14

Sale 2:

Sold for 10 keys + ~4 keys in items

http://www.tf2outpost.com/trade/29409046 - B/O of 13

Seller: https://backpack.tf/profiles/76561198359449894#!/compare/1508803200/1508976000

Buyer: https://backpack.tf/profiles/76561198139229580#!/compare/1508889600/1508976000

X = 13

Sale 3:

Quicksold for 9 keys

Seller: https://backpack.tf/profiles/76561198083769613#!/compare/1509321600/1509408000

Buyer: https://backpack.tf/profiles/76561198334126785#!/compare/1508716800/1509321600

X = 9

Sale 4:

Quicksold for 9 keys and a singular ref

Seller: https://backpack.tf/profiles/76561198334126785#!/compare/1508716800/1509321600

Buyer: https://backpack.tf/profiles/76561198121055881#!/compare/1509235200/1509321600

X = 9

Sale 5:

Sold for Bubbling Voodoo JuJu (Suggestion at 9)

No outpost

Seller: https://backpack.tf/profiles/76561198074726928#!/compare/1508025600/1508112000

Buyer: https://backpack.tf/profiles/76561198164622774#!/compare/1508025600/1508112000

X = 9

Sale 6:

Sold with a key and some ref for Kill-a-Watt Tough Guy’s Toque

Seller: https://backpack.tf/profiles/76561198342200528#!/compare/1511308800/1511395200

Buyer: https://backpack.tf/profiles/76561198254827793#!/compare/1511049600/1511395200

Can be used on the Toque.

Sale 7:

Sold for Nuts N’ Bolts Medic’s Mountain Cap + ~2 keys in items

http://www.tf2outpost.com/trade/29438219 - B/O of 13

Seller: https://backpack.tf/profiles/76561198104012008#!/compare/1510444800/1510790400

Buyer: https://backpack.tf/profiles/76561198342200528#!/compare/1510704000/1510790400

Only sale on the Mountain cap went to a quickbuyer. Excluding this sale.

Bubbling Voodoo:

https://backpack.tf/suggestion/5a2a5c2344325a68b2605ebc

Sales at:

9 (3x)

13

14

Quickbuyers for any effect at 9+ keys. Excluding 9.

Going with 13-14.