yes well i think you may as well report it to the piracy department there, because it will be checked out anyway.
if you're unsure about it, then they'll find out when they check it out.
if he's guilty, he's gone.. if he's not, then so be it. you tried to help, and you can't get in trouble for it. especially if he seemed dodgy.
good luck with it Tony, i'm sure you'll do the right thing, regardless of rewards.