I was stopped at Pizza Hut on Monday night on my way out. It was not a big deal. I was stopped a few months ago too. It does not seem that they really care about the passports but they are sure curious about where people work, what they do, how much they get paid, and how much tax is deducted. I think the passport stop is the reason they use to ask questions. Keep your nose clean and carry your passport and its all good.