Sold for 5 + Salvaged 40 + 2 Hats worth 5 refined total.

Guy accidentally traded me 6 buds, we both didn't notice until later (when I returned his buds)

5.2 comes from:

5 buds + Salvaged #40 (3.8 key average) + 5 Ref in hats (1.66 + 3.33)

Math Invloved:

3.8 keys x 5.66 ref per key + 5.00 ref = 26.508

26.508/5.66 = 4.68 keys

4.68/22 (average bud price) = 5.213 (or rounded to 5.2)

Cheers!

Proof of trade = http://i.imgur.com/94aZurb.png

His offer (5 Buds) = http://www.tf2outpost.com/trade/12747678