Suggestion: Cloud 9 Front Runner at 28–30 keys

I remember seeing the classified listing for the 28 keys pure. He said "30% off!" in the notes. The owner had not bumped it for several days, which is probably why it took so long to sell.

Judging from the listing notes, it seems like Slip(the seller of the listing I noticed) intended to quicksell the hat but was offline so he was unable to respond to the offers he had received.

Sorry that I can't provide a screenshot but I didn't know that the hat would be repriced.

All other sales, except for sale 8, indicate a lower price though than it currently has. So this hats needs to be repriced.

Yes but I'm not sure if 28 should be included in the range, because the owner obviously intended to quicksell but couldn't because he was inactive.

Sale 3 was absolutely used to price the Salty Dog. It set the high end, and cannot be used here: https://backpack.tf/suggestion/593b129f0e2cad746553de57

Sale 1 was sold the same day it was listed for 30, but was up for a while at 37 before that: http://www.tf2outpost.com/trade/28884675

28 was left unbumped as mentioned in the comments, and ultimately sold to a bot's buy order, not valid here. Omitting 28.

Sale #15 has the wrong link, but there are buyers for 27 on classifieds so it doesn't matter, it's invalid. Omitting 27.

Drill mini for sale 8 is way too high. A better one: https://backpack.tf/profiles/76561197996095002#!/compare/1495756800/1495843200 - ~41 keys worth of stuff, so 41 - 5 = 36, should be included

Additional sales:

https://backpack.tf/profiles/76561198030050182#!/compare/1494547200/1494633600 - Scatter + 2 pure, ~52, countered by sellers/probably would have been B/O capped

http://www.tf2outpost.com/trade/29186718 - B/O 35

https://backpack.tf/profiles/76561198112279227#!/compare/1497657600/1497744000 - KaW Muffs + ~2 keys of sweets, ~34

Muffs mini: https://backpack.tf/profiles/76561198112279227#!/compare/1497916800/1498003200 + https://backpack.tf/item/5375295890, ~32, should be included

https://backpack.tf/profiles/76561198011321852#!/compare/1493942400/1494028800 - 37 pure, sellers for less but pure + within the past 2 months, should be included

https://backpack.tf/profiles/76561198069559160#!/compare/1494460800/1494547200 - 30 pure (your own sale, took a day, why didn't you include this?)

https://backpack.tf/profiles/76561198044949718#!/compare/1496016000/1496361600 - With Aussie BB for Slumber Muffs, ~45 but Muffs look high judging by sellers, better used there

https://backpack.tf/profiles/76561198216561389#!/compare/1493337600/1493424000 - Searing Juju, unknown B/O, countered by sellers/probably better used on the Juju which will be outdated soon

https://backpack.tf/profiles/76561198123151330#!/compare/1494547200/1494633600

https://backpack.tf/profiles/76561198049267666#!/compare/1494460800/1494633600 - Showstopper I See You + 3 pure and 2 keys of sweets, ~36, Taunt was updated right after this sale occurred so price should be reliable here, should be included

Sales: 30 (pure/1 day total), 30 (pure/1 day after re-listing), 30 (Neckwear), 34 (Muffs), 36 (Sergeant), 36 (Taunt + sweets) 37 (pure), 45 (Muffs, better used there) 45 (Juju, unknown B/O), 52 (Scatter, unknown B/O). Mature sellers for 34/35. It is obviously pretty easy to sell this for 30 pure and usually sells fast, but it's also a common trading point. No reason to omit 34, and 36/37 as well should be included as there are several sales at that value and 37 is full pure. Average of 33.5 still comes out below the current sellers, which is good. Other sales from your original proof at 27, 28, and 30 are invalid but support a drop generally speaking, and 45/52 are either too high here or better used for the other hats involved but support the inclusion of the higher sales. Please re-suggest at 30-37.