I agree with leaving your contact info at the Apple Store with a manager and/or a number of employees.
I don't agree with going to the police because (a) it's unlikely the person who lost the card would go there; (b) friends of mine have had evidence kept forever (or at least not returned); and (c) the person who lost the card couldn't prove they'd bought it, so the police wouldn't likely return it to them anyway.
Too bad you can't dust it for fingerprints.
Edit: of course, the person who contacts you (if any) might just have read this thread, so you'll need them to provide some sort of corroborating evidence. And I'd tell the Apple employees not to give out your contact info, or just give them an email addy.
Edit 2: your English is much better than the non-English of the majority of the posters on MR.
I don't agree with going to the police because (a) it's unlikely the person who lost the card would go there; (b) friends of mine have had evidence kept forever (or at least not returned); and (c) the person who lost the card couldn't prove they'd bought it, so the police wouldn't likely return it to them anyway.
Too bad you can't dust it for fingerprints.
Edit: of course, the person who contacts you (if any) might just have read this thread, so you'll need them to provide some sort of corroborating evidence. And I'd tell the Apple employees not to give out your contact info, or just give them an email addy.
Edit 2: your English is much better than the non-English of the majority of the posters on MR.