And back up it goes.

Quicksale at 6 Keys: http://i.imgur.com/r1OQwA3.png

Listed it on classifieds for 6 Keys only for it to sell when I woke up (< 8-9 Hours)

Intended to make this suggestion earlier but noticed there was a seller at 5 Keys 13 Ref but turns out it quicksold as well

http://backpack.tf/item/4999126683

Proof of Listing: http://i.imgur.com/2FrllP6.png (Note: it only says 'Listed a day ago' because I kept the tab open and only took the screenshot just now - history link verifies quicksale)

Classifieds:

http://i.imgur.com/qQ9Xweb.png

x1 7 Keys - http://backpack.tf/item/5019608360

x1 8 Keys - http://backpack.tf/item/4976526476

x1 30 Keys - http://backpack.tf/item/4975437476

Only seller on Outpost is the same as the 30 Key seller on classifieds - http://www.tf2outpost.com/trade/28381333

Conclusion:

Quicksales at both 5 keys 13 ref and 6 keys with no sellers under 7 keys. I was considering keeping the old range in (5.6-6) and it was only a couple of days ago but looks like the market has changed quite a bit. SCM sales frequent ~6-7 keys and no sellers under 7 keys. Also, turns out the 5.6-6 breaks the 5% rule :c Therefore, although I'm not entirely confident on this range, I'll be pricing this at 6 Keys flat.

Feedback is appreciated :D