Sale 1:

Sold for 10 keys + ~9 keys in items

http://www.tf2outpost.com/trade/28004916 - No B/O

Seller: http://backpack.tf/profiles/76561198064824787#!/compare/1460505600/1460851200

Buyer: http://backpack.tf/profiles/76561198083596435#!/compare/1460419200/1460505600

X = 19

Sale 2:

Sold for 18 keys

http://www.tf2outpost.com/trade/28109003 - B/O of 18

Seller: http://backpack.tf/profiles/76561198035701234#!/compare/1461888000/1461974400

Buyer: http://backpack.tf/profiles/76561198109890826#!/compare/1461888000/1461974400

X = 18

Sale 3:

Sold for Strange Kritzkrieg + 3 keys in items?

http://www.tf2outpost.com/trade/28276348 - B/O of 17.5

Seller: http://backpack.tf/profiles/76561198138724799#!/compare/1466640000/1466726400

Buyer: http://backpack.tf/profiles/76561198111304779#!/compare/1466553600/1466812800

Item histories don't match, could just be an error on the buyer's side, as there doesn't appear to be anything removed from their perspective.

X = 18 (Rounded from 17.5)

Sale 4:

Sold for Steaming Larrikin Robin + Strange Spec. KS AWPer Hand (6)

http://www.tf2outpost.com/trade/28194665 - B/O of 17

Seller: http://backpack.tf/profiles/76561198084736296#!/compare/1464220800/1464393600

Buyer: http://backpack.tf/profiles/76561198004783619#!/compare/1464307200/1464393600

Steaming Larrikin would have to be 10 keys or less to change the value of this sale, however, there is a buyer at 10, so 10 is too low - http://puu.sh/pM1Kd/676aa0ce18.png

X = 17 (Capped by B/O)

Sale 5:

Sold for 12 keys + ~5 keys in items?

No outpost

Seller: http://backpack.tf/profiles/76561198065983951#!/compare/1462147200/1462233600

Buyer: http://backpack.tf/profiles/76561198174752809#!/compare/1462060800/1462233600

Hat history doesn’t match, I’d assume the buyer re-sold (or listed on the market) after purchase, before their backpack was scanned again

X = 17

Sale 6:

Sold for 16 keys

Seller: http://backpack.tf/profiles/76561197998939874#!/compare/1464912000/1464998400

Buyer: http://backpack.tf/profiles/76561198081875069#!/compare/1464307200/1464998400

X = 16

Sale 7:

Sold for Steaming Wayfinder (14) + 3 keys + 10 ref

http://www.tf2outpost.com/trade/28276305 - B/O of 16, re-listed multiple times

Seller: http://backpack.tf/profiles/76561198137888552#!/compare/1466467200/1466553600

Buyer: http://backpack.tf/profiles/76561198138724799#!/compare/1466467200/1466553600

X = 16 (Capped by B/O)

Sale 8:

Sold for Cloud 9 Tavish DeGroot Experience

http://www.tf2outpost.com/trade/28202668 - No B/O

Seller: http://backpack.tf/profiles/76561198076020691#!/compare/1464307200/1464393600

Buyer: http://backpack.tf/profiles/76561198033715114#!/compare/1464220800/1464393600

Seeing as there is no B/O, it would probably be better to update the Tavish with this sale Only recent sales on the Tavish are dupe sales, and it would be best not to lower the price on it based on dupe sales

Sale 9:

Sold for Dead Presidents Rubber Glove

No outpost

Seller: http://backpack.tf/profiles/76561198070817567#!/compare/1464739200/1464825600

Buyer: http://backpack.tf/profiles/76561197998939874#!/compare/1464480000/1464825600

Looks like an outlier here, might be better to use it on the Glove

Sellers:

17 keys:

http://www.tf2outpost.com/trade/28208395 - 1 month, recently lowered?

18 keys:

http://www.tf2outpost.com/trade/28270073 - 1 week

http://puu.sh/pM3FR/1bd52a630f.png

Sales at:

16

17 (2x)

18 (2x)

19

Going with 16-19