At times I’ve had napkins and straws accidentally omitted from my drive through order. I made it through the day okay. It’s irritating but stuff happens.
I just reach between the seats and grab what I need. When there isn't any between the seats, I look in the center console. If the center console is empty, I check the glove box. If the glove box is empty, I check under the seats.
If there aren't any under the seats THEN I call my lawyer to sue.