Sale 1:

Sold for 16 keys

http://www.tf2outpost.com/trade/28530770 - Offers

Seller: http://backpack.tf/profiles/76561198074789287#!/compare/1475884800/1475971200

Buyer: http://backpack.tf/profiles/76561198105245989#!/compare/1475884800/1475971200

X = 16

Sale 2:

Sold for 16 keys

http://www.tf2outpost.com/trade/28468571 - B/O of 16

Seller: http://backpack.tf/profiles/76561198006544512#!/compare/1475452800/1475539200

Buyer: http://backpack.tf/profiles/76561198173434366#!/compare/1475452800/1475539200

X = 16

Sale 3:

Sold for 15 keys

No outpost

Seller: http://backpack.tf/profiles/76561198087805689#!/compare/1478563200/1478649600

Buyer: http://backpack.tf/profiles/76561198111953519#!/compare/1478563200/1478649600

X = 15

Sale 4:

Sold for Steaming Hottie’s Hoodie + 5 keys + 6 ref

http://www.tf2outpost.com/trade/28633837 - B/O of 15

Seller: http://backpack.tf/profiles/76561198257462351#!/compare/1480723200/1481155200

Buyer: http://backpack.tf/profiles/76561198110747621#!/compare/1481155200/1481241600

Hoodie is outdated, but I doubt it would be less than 10 keys.

X = 15 (Capped by B/O)

Sale 5:

Sold with ~5 keys in items/metal/shahanshas for Starstorm Slumber Wing Mann (18)

No outpost

Seller: http://backpack.tf/profiles/76561198084990178#!/compare/1478044800/1478476800

Buyer: http://backpack.tf/profiles/76561198071493101#!/compare/1478217600/1478390400

X = 13

Sale 6:

Sold in about 2 days for 11 keys + Strange Infernal Impaler (~1.2) + 28.55 ref (1)

http://www.tf2outpost.com/trade/28626080 - B/O of 14

Seller: http://backpack.tf/profiles/76561198253555888#!/compare/1480032000/1480118400

Buyer: http://backpack.tf/profiles/76561198257462351#!/compare/1480032000/1480118400

X = 13

Sale 7:

Sold for Vivid Dread Knot

No outpost

Seller: http://backpack.tf/profiles/76561198095589372#!/compare/1479945600/1480032000

Buyer: http://backpack.tf/profiles/76561198002757046#!/compare/1479859200/1479945600

Might be better to update the Knot with this sale instead

Sale 8:

Sold for Steaming Conquistador + Rancho Relaxo (~0.5)

Seller: http://backpack.tf/profiles/76561198088305642#!/compare/1478390400/1478563200

Buyer: http://backpack.tf/profiles/76561198204219284#!/compare/1477526400/1478563200

Not many sales on the Conquistador, and its price is 3 years old. Might be better to update it with this sale instead.

Sale 9:

Sold for Smoking Barnstormer + Haunted Second Opinion (1.8 at the time)

http://www.tf2outpost.com/trade/28574652 - No B/O

Seller: http://backpack.tf/profiles/76561198053277193#!/compare/1477872000/1477958400

Buyer: http://backpack.tf/profiles/76561198095589372#!/compare/1477785600/1477958400

Given that the Barnstormer is outdated, the abundance of pure sales here already and the lack of recent sales on the Barnstormer, it may be better to update the Barnstormer with this sale instead.

Sale 10:

Sold with ~9 keys in items for Blizzardy Surgeon’s Stahlhelm

Seller: http://backpack.tf/profiles/76561198132737832#!/compare/1478304000/1478390400

Buyer: http://backpack.tf/profiles/76561198088305642#!/compare/1477612800/1478390400

Should be used to update the Stahlhelm

Sellers:

13 keys:

http://i.imgur.com/fOlHxlw.png - young, duped

http://backpack.tf/u/76561198036254026

http://www.tf2outpost.com/trade/28651638

15 keys:

http://i.imgur.com/e70jvtR.png - 19 days

http://backpack.tf/u/76561198056753441

http://www.tf2outpost.com/trade/28619792

16 keys:

http://i.imgur.com/7lyAOZ1.jpg - 7 days

http://backpack.tf/u/76561198085269574

http://www.tf2outpost.com/trade/28640416

Sales at:

13 (2x)

15 (2x)

16 (2x)

13 seems rather low, seeing as the first sale is a bit bulky, and the second sale sold in only a couple days. Excluding 13. This seems to sell consistently for 15-16 in pure.

Going with 15-16