Do they have a key drop-off box i case if you want to leave rental car there

Yes

Yes. Generally all branches have a drop box for after hour drops. They are normally located near the main entrance to the branch and are tan in color. Be mindful that even though you drop the keys off, you are still legally responsible for the car (i.e. damages, theft, etc.) More simply, you are responsible for the vehicle until the keys are with an Enterprise representative. Whether that be a face to face return or the next business hours when they check the box. Hope this helps!

Yes they do