Sale 1:

Sold with 8 keys for Spec. KS Aussie Sniper Rifle (24)

http://www.tf2outpost.com/trade/28844723 - No B/O

Seller: http://backpack.tf/profiles/76561198192602363#!/compare/1490313600/1490400000

Buyer: http://backpack.tf/profiles/76561198146133967#!/compare/1490313600/1490400000

X = 16

Sale 2:

Sold for 15 keys

http://www.tf2outpost.com/trade/28887832 - B/O of 15

Seller: http://backpack.tf/profiles/76561198080179568#!/compare/1493510400/1493596800

Buyer: http://backpack.tf/profiles/76561198269178506#!/compare/1493424000/1493510400

X = 15

Sale 3:

Bulk for Circling Heart Le Party Phantom

Seller: http://backpack.tf/profiles/76561197983558864#!/compare/1490313600/1490400000

Buyer: http://backpack.tf/profiles/76561198121731353#!/compare/1490313600/1490400000

Sale 4:

Bulk for Duped Beams Glengarry

Seller: http://backpack.tf/profiles/76561198146133967#!/compare/1490486400/1490572800

Buyer: http://backpack.tf/profiles/76561198068429580#!/compare/1490486400/1490572800

Sale 5:

Bulk for pure

Seller: http://backpack.tf/profiles/76561198068429580#!/compare/1490572800/1490659200

Buyer: http://backpack.tf/profiles/76561198018101085#!/compare/1490572800/1490659200

Sale 6:

Sold with 3 keys for Tesla Coil Tungsten Toque

Seller: http://backpack.tf/profiles/76561198018101085#!/compare/1490832000/1490918400

Buyer: http://backpack.tf/profiles/76561197964171516#!/compare/1490832000/1490918400

Can be used to price the Toque.

Sale 7:

Sold for Massed Flies Killer’s Kabuto

Seller: http://backpack.tf/profiles/76561197964171516#!/compare/1492387200/1492473600

Buyer: http://backpack.tf/profiles/76561198051443288#!/compare/1492387200/1492473600

Guess what else needs updating

Sellers:

15 keys:

http://www.tf2outpost.com/trade/29198535 - 2 weeks

http://backpack.tf/u/76561197990935886

~15.2:

http://i.imgur.com/Gjnf7Em.png - 2 days

http://backpack.tf/u/76561198043988930

http://www.tf2outpost.com/trade/29221299

~15.5:

http://i.imgur.com/iqI1Qoq.png - 5 days, most likely lowered:

http://backpack.tf/item/201490308

http://backpack.tf/u/76561198304138933

16 keys:

http://i.imgur.com/pSRSbTU.png - 1 month

http://backpack.tf/u/76561198034312547

19 keys:

http://i.imgur.com/sUEhBIW.png - 2 months

http://backpack.tf/u/76561198086948995

Offers:

http://www.tf2outpost.com/trade/28880692 - 1 month

http://backpack.tf/u/76561197988149063

Sales at:

15

16

Going with 15-16.

Was originally using this to price the Purple Confetti Magistrate, however, there is only one sale, and it's higher than the 7 month old seller at 15 keys:

Sold for Massed Flies Le Party Phantom (Mini at 15.5 below)

No outpost, but:

https://webcache.googleusercontent.com/search?q=cache:hzx7MAoaNW8J:https://backpack.tf/stats/Unusual/Magistrate%2527s%2520Mullet/Tradable/Craftable/7+&cd=1&hl=en&ct=clnk&gl=au

http://i.imgur.com/m0gAocj.png - B/O of 16

Seller: http://backpack.tf/profiles/76561198086948995#!/compare/1492992000/1493164800

Buyer: http://backpack.tf/profiles/76561198051443288#!/compare/1493078400/1493164800

X = 16

Seller at 15:

http://i.imgur.com/V8AXipB.png

So, no idea what to do here, probably better to leave this and wait for other sales.