I don't think containers that come from the customer are allowed behind the counter here for food safety reasons.
Here they put a sheet (that they would use anyway) on the scale to separate it physically from the container, and what enters the container doesn't leave it (or goes to the trash).
Here they put a sheet (that they would use anyway) on the scale to separate it physically from the container, and what enters the container doesn't leave it (or goes to the trash).