Let me tell you a story. Once upon a time, I was bored so I said "Why not make a suggestion?" The end. Also, it's my first one and will probably flop like a half cooked flounder. Let's hope not :D

Sellers

https://www.tf2outpost.com/trade/10118821 (Unsuccessful 3 days, no offers)

https://www.tf2outpost.com/trade/10027495 (Unsuccessful 6 days, an offer of "2 keys if you add 1 ref")

https://www.tf2outpost.com/trade/10076970 (Unsuccessful for 5 days at 1 key + 3 ref, no offers)

https://www.tf2outpost.com/trade/3565468 (Not sold for a whopping 5 months! However, I'm not sure about this one as the owner said that he has attachments to these particular items, and turned down offers of 1-2 keys. Last offer was a month ago, of 3.33 + a replacement Noble. Still unsold.)

https://www.tf2outpost.com/trade/10096412 (Unsuccessful for 4 days, No offers)

https://www.tf2outpost.com/trade/10020556 (Unsuccessful for 1 week, no offers, selling at 1 key + 3 ref)

https://www.tf2outpost.com/trade/10009757 (Unsuccessful for 1 week, no offers)

https://www.tf2outpost.com/trade/10130517 (Unsuccessful for just 2 days, no offers)

https://www.tf2outpost.com/trade/10129805 (My trade, no offers as of yet for 2 days)

https://www.tf2outpost.com/trade/10003070 (Unsuccessful for 1 week, no offers)

https://www.tf2outpost.com/trade/10100519 (Unsuccessful for 4 days, no offers)

https://www.tf2outpost.com/trade/10097343 (Yes, it's still an early trade, but has 1 offer of a Vintage Glengarry Bonnet, priced at 1-1.25 keys)

https://www.tf2outpost.com/trade/10119178 (Unsuccessful for 3 days, no offers)

https://www.tf2outpost.com/trade/6447479 (Unsuccessful for 4 months, last offer was 3 weeks ago at 2 keys)

https://www.tf2outpost.com/trade/10070742 (Unsuccessful for 5 days, no offers. And on a side note, oh look it's cleverpun!)

Buyers

Also note, that there might not be many buyer trades for good proof, as most are either mega-lowballs or quickbuys.

https://www.tf2outpost.com/trade/10059177 (Buying for 5.88 ref. While it isn't at the current price, it's not a super lowball, and probably one of the few buyer trades above 1 key, counting keys as 4.66.)

https://www.tf2outpost.com/trade/8148594 (Buying for 5.66. Same case as the first buyer trade.)

https://www.tf2outpost.com/trade/10097244 (Trading a Genuine Warsworn Helmet for any listed items, including Vintage Noble. Genuine Warsworn is at current value of 1.5-1.75 keys.)

Welp, this is all the proof I could gather on Outpost with sifting through all of the lowballs or Level 69, 99, 100 etc. and the occasional level swap or 1-2-3 set. In short, there's really not very much demand for this item, not very many sold at the current high end (which is what pretty much everyone is selling for) so, this needs a bump back down to 1.5 keys flat. Now then, let's see if this suggestion is well received. If not...oh well, there's always time to try again.