I would have returned it for a $5,000 reward, also... granted, the cat was probably worth more than that, but even if someone tried selling it to someone else for profit, the second that family took it to a vet (assuming they did) and they scanned and found the microchip, they would have had to contact the owner's who's info showed up on the microchip, anyway. But bottom line, good thing someone found it and returned it.

Vacationing with your cat... that's crazy to me, though.

Oh and for the record I would have returned him too, reward or not (per my first sentence, just implying that *anyone* would return a found pet for that amount of money!!).