Mainly doing this on B/Os and chat images (I know, not the greatest way to suggest, but they're all fairly old/should have been picked up by now if the price were still fresh.)

1st Link- http://www.tf2outpost.com/trade/10769192

-Best offer of NNB Noir+2 keys (about 14-16 after resale) in about 5 days.

2nd Link- http://www.tf2outpost.com/trade/10618288

-Best offer was 18 keys in a week.

3rd Link- http://www.tf2outpost.com/trade/10779765

-B/O of [/b]19 keys, unsold for 5 days[/b], should have been picked up by now if price were correct.

4th link- http://www.tf2outpost.com/trade/10938060

-B/O of 20 keys, was willing to sell for basically 15+minor sweets http://i.imgur.com/aqRCn1D.png

5th Link- http://www.tf2outpost.com/trade/10934871

-B/O of 19 keys, was the previous owner of the 4th link, sold for 15 according to the preceding owner http://i.imgur.com/aqRCn1D.png

In my opinion, several B/Os at 19 and 20 (and the unsolds at those B/Os as well) that are selling for about 16 anyways are redflags that the price needs to be changed around. Might be considered quickselling, but they're selling for close enough to the original price to not really be quicksells but more so just undermarket. Those sales determined the 16 key lower limit as the lower limit should sell within a few hours to a day. The unsold B/Os at 19 and 20 determined the higher limits.

Or at least in my opinion. Comment as you see fit.