Sale 1:

Sold with ~4.5 keys in items for Pro. KS Aussie Grenade Launcher (22.5)

No outpost

Seller: http://backpack.tf/profiles/76561198032176942#!/compare/1480809600/1480896000

Buyer: http://backpack.tf/profiles/76561198133443997#!/compare/1480896000/1480982400

X = 18

Sale 2:

Sold for Cloud 9 Samur-Eye + ~1 key in items

http://www.tf2outpost.com/trade/28609157 - B/O of 17

Seller: http://backpack.tf/profiles/76561198125884909#!/compare/1479081600/1479254400

Buyer: http://backpack.tf/profiles/76561198049516430#!/compare/1478908800/1479254400

Should most likely cap at the B/O

X = 17 (Capped by B/O)

Sale 3:

Sold for 16 keys

http://www.tf2outpost.com/trade/28618108 - No B/O

Seller: http://backpack.tf/profiles/76561198146216380#!/compare/1479859200/1480118400

Buyer: http://backpack.tf/profiles/76561198087986920#!/compare/1479254400/1480377600

X = 16

Sale 4:

Sold for Strange Pro. KS Festive Knife (15)

No oupost

Seller: http://backpack.tf/profiles/76561198162178398#!/compare/1480982400/1481587200

Buyer: http://backpack.tf/profiles/76561198041822925#!/compare/1480896000/1480982400

X = 15

Sale 5:

Quicksold for 14 keys

No outpost

Seller: http://backpack.tf/profiles/76561198041822925#!/compare/1480896000/1480982400

Buyer: http://backpack.tf/profiles/76561198286234945#!/compare/1480809600/1480982400

X = 14

Sale 6:

Bulk for Hellish Inferno Buy a Life

Seller: http://backpack.tf/profiles/76561198211437660#!/compare/1478649600/1478736000

Buyer: http://backpack.tf/profiles/76561198328842462#!/compare/1478649600/1478736000

Sale 7:

Sold for Bubbling Noble

http://www.tf2outpost.com/trade/28597728 - B/O of 18

Seller: http://backpack.tf/profiles/76561198328842462#!/compare/1478649600/1478736000

Buyer: http://backpack.tf/profiles/76561198125884909#!/compare/1478649600/1478736000

This sale most likely will not change the range here, due to the B/O. Could be used to update the Noble, as there are sellers for cheaper on it.

Sale 8:

Sold for Skill Gotten Gains Oblooterated

No outpost

Seller: http://backpack.tf/profiles/76561198093892890#!/compare/1479513600/1479600000

Buyer: http://backpack.tf/profiles/76561198064406521#!/compare/1479513600/1479600000

This looks like a large outlier. Doubt this sale should be used for either the taunt or the hat.

Sale 9:

Bulk for Beams Chieftain’s Challenge

Seller: http://backpack.tf/profiles/76561198211445756#!/compare/1479945600/1480032000

Buyer: http://backpack.tf/profiles/76561198089224738#!/compare/1479945600/1480032000

Sale 10:

Sold with 4 keys in items/ref for Smoking Le Party Phantom

Seller: http://backpack.tf/profiles/76561198133443997#!/compare/1481328000/1481414400

Buyer: http://backpack.tf/profiles/76561198059876944#!/compare/1481328000/1481414400

Probably better to use this for the Party Phantom. If not, it should still fit in the range here, based on the open phantom suggestion.

Sellers:

17 keys:

http://www.tf2outpost.com/trade/28654968 - 2 days

http://backpack.tf/u/76561198059876944

21 keys:

http://www.tf2outpost.com/trade/28653034 - 3 days

http://backpack.tf/u/76561198053747026

Sales at:

14

15

16

17

18

14 quicksold, excluding 14.

Going with 15-18