Sale 1:

Sold for Neutron Star Nasty Norseman (22.5)

No B/O’s on Outpost

Seller: https://backpack.tf/profiles/76561198011321852#!/compare/1500076800/1500163200

Buyer: https://backpack.tf/profiles/76561198184012267#!/compare/1500076800/1500163200

X = 23

Sale 2:

Sold for Peace Sign Snaggle (20.5, rounding down due to month old seller at 19 keys)

No outpost

Seller: https://backpack.tf/profiles/76561198098410618#!/compare/1497830400/1497916800

Buyer: https://backpack.tf/profiles/76561198056657724#!/compare/1497830400/1497916800

X = 20

Sale 3:

Sold for Kill-a-Watt Industrial Festivizer (18.5)

No outpost, don’t remember my B/O, was probably 20 or something

Seller: https://backpack.tf/profiles/76561198021055079#!/compare/1496966400/1497052800

Buyer: https://backpack.tf/profiles/76561198369345535#!/compare/1496880000/1497052800

X = 19

Sale 4:

Sold for Steaming Flamboyant Flamenco (19)

http://webcache.googleusercontent.com/search?q=cache:v4q8gi6fW80J:www.tf2outpost.com/trade/29191381+&cd=1&hl=en&ct=clnk&gl=au – B/O of 18

Seller: https://backpack.tf/profiles/76561197964171516#!/compare/1496534400/1496620800

Buyer: https://backpack.tf/profiles/76561198150155581#!/compare/1496620800/1496707200

X = 18 (Capped by B/O)

Sale 5:

Sold for Max’s (Sellers around 17) + Doublecross-Comm (>0.5)

No outpost

Seller: https://backpack.tf/profiles/76561198128606394#!/compare/1500336000/1500422400

Buyer: https://backpack.tf/profiles/76561198047852423#!/compare/1500249600/1500336000

X = 18

Sale 6:

Sold for Spec. KS Aussie Grenade Launcher (15) + Spec. KS Botkiller Flamethrower (1) + 1 key

No outpost

Seller: https://backpack.tf/profiles/76561198081041276#!/compare/1497571200/1497916800

Buyer: https://backpack.tf/profiles/76561198098410618#!/compare/1497830400/1497916800

X = 17

Sale 7:

Sold for Stormy Milkman (15.5)

No outpost

Seller: https://backpack.tf/profiles/76561198150155581#!/compare/1496707200/1496793600

Buyer: https://backpack.tf/profiles/76561198021055079#!/compare/1496707200/1496793600

X = 16

Sale 8:

Sold in ~1 day for 15 keys

http://www.tf2outpost.com/trade/29226191 - B/O of 15, seller confirms sale (legend)

Seller: https://backpack.tf/profiles/76561198024925599#!/compare/1497225600/1497312000

Buyer: https://backpack.tf/profiles/76561198255863734#!/compare/1497225600/1497312000

X = 15

Sale 9:

Sold for 15 keys

Seller: https://backpack.tf/profiles/76561198210225228#!/compare/1495065600/1495152000

Buyer: https://backpack.tf/profiles/76561198362414257#!/compare/1495065600/1495152000

X = 15

Don’t know how long the seller has owned the item, as it doesn’t appear in their compare link.

Sale 10:

Sold for Miami Nights Tam (14)

No outpost

Seller: https://backpack.tf/profiles/76561198369345535#!/compare/1497139200/1497225600

Buyer: https://backpack.tf/profiles/76561198024925599#!/compare/1497139200/1497225600

X = 14

Sale 11:

Bulk for Green Confetti Cold Killer

Seller: https://backpack.tf/profiles/76561198043503046#!/compare/1498521600/1499040000

Buyer: https://backpack.tf/profiles/76561198011321852#!/compare/1498435200/1498521600

Sales at:

14

15 (2x)

16

17

18 (2x)

19

20

23

Buyers at 14+:

http://i.imgur.com/I6YCozu.png

Excluding 14.

15 quicksold once, and the other sale took between 1 to 5 days. Can’t identify which one it was, so I’ll just exclude it.

23 is an outlier, and would be much lower if we knew the B/O. Excluding 23.

Going with 16-20.