I think I've got this sussed now with some help from Foamy. This suggestion will probably get a bit messy.

Sale #1: 70 keys,

http://www.tf2outpost.com/trade/28035088 - Unusual Aqua Marine Rocket Launcher (FN/Hot) with a 70 B/O.

http://backpack.tf/profiles/76561198079315133#!/compare/1460592000/1460678400 (Seller)

http://backpack.tf/profiles/76561198011321852#!/compare/1460592000/1460678400 (Buyer)

Using 70 here as most recent sale for Aqua was for a Prof Aussie Rocket Launcher, thanks foamy for finding that.

ttp://www.tf2outpost.com/trade/28106567 - B/O of 70 (see comments).

This is the only definite sale outside of SCM/PayPal, I've included a sale that is just outdated after the current sellers as supporting evidence for raising as there are few traceable sales.

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We've got 4 current sellers,

http://www.tf2outpost.com/trade/28121366 - 110 B/O

http://www.tf2outpost.com/trade/27885328 - 120 B/O (on Backpack.tf listing)

http://www.tf2outpost.com/trade/27684788 - 160 B/O

http://www.tf2outpost.com/trade/27965973 - NO B/O. No before anyone says anything this has not sold. It's been in his friends inventory for a while, I've check backpack histories as well to confirm this. http://backpack.tf/profiles/76561198077973553#!/compare/1457510400/1457596800 the MS Drill was also loaned to his friend as seen in the items outpost listing and as such was not used to buy the HWNN. The other two unusuals seen in the history are unrelated to this suggestion.

If any of these actually sell I'll re-suggest.

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As for the sale that's just out of date.

From the 23rd of February - Sold for a Vintage Prof Luger, Bubbling HWNN and SF Bonk Helm.

http://imgur.com/a/ycciN - http://backpack.tf/profiles/76561197976307152#!/compare/1456128000/1456300800

Both unusuals are outdated but it can be assumed together are above the price I am suggesting.

Bubbling lowest current listing is at 30, and there are buyers for the SF Bonk on Classifieds at 52/53.

https://gyazo.com/5710adb3e9ff8d387e77e92af1e6d367

https://gyazo.com/7418558070867d3999b0e800981f886f

Suggesting at 70 flat, feedback would be greatly appreciated for this suggestion.