ordered a psp game from the states off ebay

last week
all fine 7 dandy till yesterday fri morning
wakes up @3pm after night shift post onthe hall floor
got us mail but the envelope has been blatently been ripped open
just the paypal slip inside no small cd for the psp

DOHHH
i know the postman a bit hes ok so WTF post it through the box like that
went to local sorting office they gave me a insurance claim form
but was so hot headed and fumming just took it and walked out
bloke on the desk said wot does it look like the cd this often happens

SO WOT DO I DO NOW

WHO IS LIABLE
never had this problem before pissing me right off
i imagine coss its from the usa ONLY GONNA MAKE MATTERS WORSE
IS THERE A EBAY solution to this
sorry if theres no replys till sunday COSS imm off to blackburn for the
weekend @ 3pm to get TANKED UP & drown my sorrows

THEY MIGHT LEARN TO SWIM
ALL HELP WOULD BE USEFULL
regards steve