I canthelp you, dont have the parts. You could always help him and do the figure up like the 1980s storm with the mohawk, that would be an easy scratch build.
On another note, did the seller say those parts were missing? If not, you should file a complaint.
I did, got a set of 4 gundam kits, one was open, the head was missing, I got back half of what I paid for the lot, basicly for the price, ended up only paying for one (the cheapest at that)