It’s more than likely, as I’ve seen in the past, that many sheets will end up in the garbage together with the left-overs.

Perhaps it’s important to include a heading in BOLD letters stating “Please make sure this sheet (Blatt) is treated with respect and not left on the tables where the waiters will dump them in the trash”.

Also, people need to be mindful not to carry them in their pockets when they enter the restrooms.

Hatzlochoh!