We pulled in late last night in pouring rain and no one was at field office at park. We got the envelope to pay but can’t find the drop box. Can anyone tell me where it’s located?

There's a white post in front of Ranger office with a drop slot.

It is the post there by the front restroom. By the water fountain

Find a camp host. I thought there was a slot in the door.

It's at the field office

It is by the boat ramp.