This one would not fit in a normal envelope. What happens in the US when you get something that doesn't fit into your mail slot? I just know that in Finland, i

This one would not fit in a normal envelope. What happens in the US when you get something that doesn't fit into your mail slot? I just know that in Finland, in such cases you have to go to the post office to get the package, so I've tried to avoid sending such things as part of the regular shipments. I might still add an option to order those separately.