[towelguy]

Isn't it common in Restaurants to leave the money in a tray?

Something much more weird I think is the money envelopes. I once took classes by a Japanese lady who, the day before we would pay for the next month, gave us these envelopes the size of a bill and asked us to bring the money in them, said that Japanese never hand money directly, always in envelopes. The next day she took the envelopes and didn't even open them to count the money.