As I've said on a different thread, both Paypal and Ebay need you to let them know within 30 days to be totally covered by their insurance. I've waited longer than this for 45s before and they've eventually turned up, save for one parcel which never did. As I was out of time I lost it all (having said that it was only $25 so it could have been a lot worse). I'd keep trying to email the seller, but to be safe, you need to lodge within 30 days - check out the ebay and Paypal sites. You've got nothing to lose by lodging your claim - if the seller is legit it will probably hurry them along a bit. Good luck!
Rich