16 key "unsold":

For the unsold at 16, as mentioned in your last suggestion ( http://backpack.tf/vote/id/5518e304b98d88271c8b4627 ), its a sold.

I believe it was a quicksell as his trade was made on the 23rd of March and within one day he sold it

(his backpack on the 23rd of March, day of sale http://backpack.tf/profiles/76561198006050964?time=1427094000 * ).

Not sure if he selling his new one, I'll add and ask.

As for the 15 key sellers/sales:

http://www.tf2outpost.com/trade/25531172 - Sold within 1 day, without a bump, quicksell;

http://www.tf2outpost.com/trade/25277956 - horrid bumping, didn't bump in 4 days;

http://www.tf2outpost.com/trade/25532940 - 1 day old, sorta young.

^ He bought a quicksell ( http://www.tf2outpost.com/trade/25532800 , sorry if its irrelevant information).

Staying neutral, to see what happens to the, only valid, unsold at 15 ref. So far seems like a downvote to me.

---*Edit*---

Compacted info, less wall of text, and added classified info, look below. *Fixed backpack link

Forgot the classifieds, you mention two were on sale at 16 keys at the time of your price suggestion.

Not sure if one sold or was simply removed, http://i.imgur.com/wbRAzfH.png .

15 key seller, brian9096, seems to have a buyer: http://steamcommunity.com/profiles/76561198063126529 (check comments), Piazano;

As for the only unsold at 16 keys, #r h o o b a r's, he doesn't seem to have been online these past 5 days or doesn't bump at all http://i.imgur.com/wImFL2I.png .

#Don't be lazy and search on your proof a bit