As you all know, we have lots of crime in California, so a plain ol' mail drop would not work here. When working for Bank of America, I learned how the criminal uses fish line and hooks to pull money from the bank's night drops and it's really amazing. The night drops have a rounded panel in them so that when the deposit bag is placed in the drop, the rounded panel swoops the bag so that it drops down into the receiving area. The rounded panel prevents you from even seeing down there, it is like a metal wall! Yet, criminals can manage to pull things out.

Perhaps a mail drop would be OK in low crime areas if the slot where high enough, there were no widows to see where the checks/envelopes drop and there is no container to catch the deposits. That way the criminal couldn't see what he was doing, it is a long way down so they don't have as much control over the fishing device they are using, and the deposits would scatter and not be confined to an area in which to fish. Allowing truck keys to be deposited in a mail slot seems risky, because due to their weight, they would be easier to catch and then, of course, the truck could be stolen.

For those few people who want to drop off their payment after hours, it may be cheaper and safer to provide them a stamped, self addressed envelope. Cash deposits should be discouraged; Wal-Mart charges only 33¢ for money orders and there are a lot of places that charge nothing.