Don't mean to be hijacking super medic. But this is pretty much using his proof with a little more touch ups.

Sale 1:

Burning German Gonzila* (40) and Severed Max's Head (29 keys) which totals to 69 Keys

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

*mini on gonzilla.

Sold for 4 buds (10 keys at the time, making it 40 keys)

Before: http://backpack.tf/profiles/76561197978915028?time=1426575600

After: http://backpack.tf/profiles/76561197978915028?time=1426662000

Sale 2:

Sold for a max's + 2 buds

(39 + 12.5x2 = 64)

What original owner bought it for on 1-8-15:

Max's Severed Head (39–40 keys) + 2 Earbuds (12-13) each which made about 5 buds at the time of sale

as shown in the original owner's bp : http://i.imgur.com/JXFHB7P.png

history of the hat shows both owners: http://i.imgur.com/NlG9o3T.png

proof of the max head/ other items being owned by last owner:

http://i.imgur.com/VcnHt6n.png

http://i.imgur.com/jz7bOKe.png