Sale 1:

Sold for 10 keys + Strange Southie Shinobi (~3.5)

No outpost

Seller: https://backpack.tf/profiles/76561198356522924#!/compare/1506470400/1506556800

Buyer: https://backpack.tf/profiles/76561198128578694#!/compare/1506384000/1506556800

X = 14

Sale 2:

Sold for Spec. KS Aussie Black Box (~12.5) + Spec. KS Frying Pan (~1)

http://www.tf2outpost.com/trade/29383513 - B/O of 14

Seller: https://backpack.tf/profiles/76561198128578694#!/compare/1506902400/1506988800

Buyer: https://backpack.tf/profiles/76561198143765326#!/compare/1506988800/1507161600

X = 14

Sale 3:

Sold for Aussie Grenade Launcher (13)

http://www.tf2outpost.com/trade/29395141 - B/O of 13

Seller: https://backpack.tf/profiles/76561198119428262#!/compare/1507766400/1507852800

Buyer: https://backpack.tf/profiles/76561198085963539#!/compare/1507766400/1507852800

X = 13

Sale 4:

Sold in ~1 day for 12 keys (IDs match)

Seller: https://backpack.tf/profiles/76561198045692488#!/compare/1509235200/1509321600

Buyer: https://backpack.tf/profiles/76561198178902410#!/compare/1509321600/1510531200

X = 12

Sale 5:

Sold for Aussie Black Box (12)

Seller: https://backpack.tf/profiles/76561198351299890#!/compare/1506297600/1506384000

Buyer: https://backpack.tf/profiles/76561198356522924#!/compare/1506297600/1506384000

X = 12

Sale 6:

Sold for 12 keys + possibly some ref (buyer’s compare link)

Seller: https://backpack.tf/profiles/76561198304138933#!/compare/1507248000/1507334400

Buyer: https://backpack.tf/profiles/76561198187215751#!/compare/1507334400/1507593600

X = 12

Sale 7:

Sold for 12 keys + some ref

Seller: https://backpack.tf/profiles/76561198304138933#!/compare/1509840000/1509926400

Buyer: https://backpack.tf/profiles/76561198255108979#!/compare/1509840000/1510099200

X = 12

Sale 8:

Sold for 12 keys

Seller: https://backpack.tf/profiles/76561198349886701#!/compare/1510185600/1510272000

Buyer: https://backpack.tf/profiles/76561198201986323#!/compare/1510272000/1510531200

X = 12

Sale 9:

Sold for 12 keys

Seller: https://backpack.tf/profiles/76561198049013101#!/compare/1510704000/1510790400

Buyer: https://backpack.tf/profiles/76561198187642154#!/compare/1510704000/1510790400

X = 12

Sale 10:

Bulk for Scorching Combustible Kabuto

Seller: https://backpack.tf/profiles/76561198040224815#!/compare/1507593600/1507680000

Buyer: https://backpack.tf/profiles/76561198119428262#!/compare/1507593600/1507680000

Sale 11:

Sold for Orbiting Fire Rimmed Raincatcher + 2 keys

http://www.tf2outpost.com/trade/29397340 - B/O of 13

Seller: https://backpack.tf/profiles/76561198085963539#!/compare/1507852800/1507939200

Buyer: https://backpack.tf/profiles/76561198336588464#!/compare/1507852800/1507939200

This sale will either fall into the range or be countered by buyers. No need to look into this sale any further.

Sale 12:

Sold for Peace Sign Brain-Warming Wear

Seller: https://backpack.tf/profiles/76561198201986323#!/compare/1510272000/1510531200

Buyer: https://backpack.tf/profiles/76561198213198551#!/compare/1510531200/1510617600

Probably better to use on the Brain. Range appears to be pretty solid here already.

Sale 13:

Sold for Cyclone Bucking Bronco

Seller: https://backpack.tf/profiles/76561198187642154#!/compare/1510876800/1510963200

Buyer: https://backpack.tf/profiles/76561198059768371#!/compare/1510876800/1510963200

Should be used on the Bronco.

Sellers:

14 keys:

https://i.imgur.com/PVJJL6o.png - 7 days

Sales at:

12 (6x)

13

14 (2x)

Going with 12-14.