What happens to leveling discs between prefabricated garage and foundation?

Can someone provide information - what actually happens to the leveling pads that the technician places between the foundation and the garage when setting up prefabricated garages upon their delivery/installation? There are various statements about this. Thanks! Best regards Stef

Here there are the most different statements.

For example ... ?
On the sixth Sunday, are they allowed to be eaten up?