Well I looked around for hats that don't get updated often and I figured 3 months since a failed suggestion and 8 months from an accepted one is acceptable. Now for the current research:

Research begun 3/14/2013

*3/7/2013 is a placeholder for 1 week ago

http://www.tf2outpost.com/trade/8919541 (looking for offers) Created late February early march

Offers:

Steaming Lord cockswain Pith helmet 3/7/2013 (value at 22/25 keys old price)

TS Bills, 6 keys, 1 ellis cap 3/7/2013 (value at a little over 16 keys)

10 keys 3/7/2013 (value at 10 keys duh)

All Father+Pink Dasinhasin+ Merc Muffler 3/12/2013 (valued at 7-8 keys, woof)

Most of his bp (just going to assume 10+ keys) 3/18/2013

13-14 keys 3/18/2013

http://www.tf2outpost.com/trade/9059254 (B/O 1 bud) Created 3/7/2013

Offers:

14 keys (considered low) 3/18/2013

http://www.tf2outpost.com/trade/9096199 (B/O 1 bud) Created 3/7/2013

Offers:

16 keys 3/11/2013 (valued at 16 keys duh)

14 keys + sweets. 3/18/2013

http://www.tf2outpost.com/trade/9145993 (offers) Created 3/9/2013

Offers:

Nuts and Bolts Heavy Duty Rag 3/9/2013 (valued at 14-16 keys)

16 keys 3/10/2013 (valued at 16 keys)

Bubbling Big Chief 3/11/2013 (valued at 17-22 keys)

All Father+ Pink Dasinhasin+ Merc Muffler 3/12/2013 (valued at 7-8 keys, woof)

BaF Bills, a key, Gold mk 2 sniper, Gold mk 2 medigun, the cremator’s conscience (white), vintage rubber glove (TS), Battle bob (white), Hero’s tail (grey) (rough guesstimation of 20-21 keys)

http://www.tf2outpost.com/trade/9244846 (B/O 20 keys C/O 12 keys) Created 3/13/2013 Closed 3/18/2013

Offers:

black bills +2 keys 3/14/2013 (valued at 11-12 keys)

S.F Sandvich 3/14/2013 (valued at 7-8 keys)

12 keys 3/14/2013 (valued at 12 keys)

NaB Ze Goggles and a side satchel (16-20 keys)

http://www.tf2outpost.com/trade/9247432 (offers and spy unusual looking) Created 3/13/2013

No offers for the Oto Mirror yet

http://www.tf2outpost.com/trade/9248870 (B/O 18 keys C/O 13 keys) Created 3/13/2013 Closed 3/16/2013

Offers:

13 keys 3/14/2013

Armored authority bubbles (negotiating) 3/14/2013

Sold for 16 keys

http://bazaar.tf/trade/147387 (created early March, late February.)

Offers:

3 successive craft number doublecross comm of 8545,8546,8547 (Unknown Value) 3/11/2013

9 keys and TS Desert Marauder (Valued at 10 keys) 3/7/2013

A Key and a ref (yeah…….) 3/7/2013

http://bazaar.tf/trade/152582 Created 3/7/2013

Nothing here

Nothing on Dispenser.tf

Marketplace is not working for me currently

http://www.tf2tp.com/trade.php?trade=9227383 (closed 3 days ago)

http://www.tf2tp.com/trade.php?trade=9225063 (mirror was deleted)

http://www.tf2tp.com/trade.php?trade=9206763 (bumped 4 days ago)

http://backpack.tf/classifieds/search/mirror 1 listed for 1 bud

Highest offer on each trade:

Steaming Lord Cockswain Pith Helmet (22-25 key value)

14 keys

16 keys

Bubbling Big Chief (17-22 keys)

NaB Ze Goggles and a side satchel (16-20)

Sale of 16 keys

9 keys and a desert marauder (about 9.5 keys)

Things to note: offers 10 and under are rejected it seems 16+ is the actual low sale value, and taking the middle value of the unusual offers is about 18 maybe 20 key high end.

This complies with all rules listed for submission, plus I don't own an Oto Mirror. Suggestions, feedback, a new price range, etc would all be appreciated. (especially feedback on price ranging because I'm not sure where to place it or just reconfirm the pricing from 8 months ago or leave it alone.)

Edit:

Confermed sales

http://www.tf2outpost.com/trade/9282462 18 keys (thanks Liddojunior)

http://www.tf2outpost.com/trade/9248870 16 keys (stated sold on trade notes)