Security Information on Drive-Through Windows

I was asked two questions regarding security at the drive-thru window and would like your input. 1) If a robber sends a note and/or shows a weapon at the drive-through window​, does the teller follow the robbery protocol as a lobby robbery? (I said yes - just want to verify). 2) If a bomb is placed in the drive-through​ tube/drawer, do they send it back? What do they do? (I say don't move bomb; lock down the facility and evacuate. Call police. I don't know that there's any safe way to alert others in the drive-thr​ough​.)