Overpay Calculated. Proof:

Sale #1 :

http://www.tf2outpost.com/trade/18498554 (Look at description)

http://www.tf2outpost.com/trade/18013993 (Look at last offer)

It was sold for a C9 Tartan Spartan + DBD Pyro Slug and 10 keys.

That equates to = (Using prices on May 1st, the day the offer was made)

4.85 (tartan) buds + 4.4 buds (slug price) + 10 keys (~0.6 buds)

Total is 9.2 buds + 0.6 buds. Using overpay on the 9.2 buds as it was unusuals, we get

8.28(rounded to 8.3) buds + 0.6 buds = 9 buds.

Sale #2 :

http://www.tf2outpost.com/trade/19927134 - Look at last offer

http://backpack.tf/profiles/76561198078648512?time=1403469302 - His BP at the time

So, it was sold for a GBH Anger which was priced recently at 11.8~ buds.

Taking overpay into account, thats 11.8 * 0.9 = 10.62 buds. Since the B/O in pure was 10 buds, gonna price it at 10.

2 sales, one sale as lower end and one sale as higher end. No mini-suggestions needed as all the unusuals here have a young price.

Constructive criticism welcomed.