This is probably a dumb question but is there supposed to be an inside (interior) floor board drain plug and a outside (exterior) floor board drain plug?
They should have put two behind the seats, mine filled up there and I had to soak it up with a towel after going downhill and hitting the brakes to get most of it to the front
I've got 4 plugs sitting on my kitchen table. I'm pretty sure each one was under a different floor mat when I took them out. If it wasn't raining so hard I'd go take a look to verify. Maybe they were added from the factory sometime around 2003 when a bunch of things were changed. I know they weren't added by someone after the fact.