I've had the same deal when I got mine, and I took the wood grain

L) off and replaced it with the factory "bread box". (GM used that because they thought the governnment was going to require air bags at the time.) I never
could get all four nuts onto the pad's bolts. Since then, I've had my entire interior apart for rejuvenation
(I'm actually getting quite good at it!
) and there is no way that I can see to re-attach all four nuts.
The thing was installed at the factory with the entire dash carrier assembled seperately from the rest of the car, then dropped in place. That would be the only way to reach all four of the nuts, that I can see at least. Hell, with the pad in place and three of the four nuts on, you can't even see the fourth to get a wrench on it (or your fingers for that matter!). This is with the dash cap off, the hush panel underneath off, the information center was out of the dash, even the duct work for the ventilation system was out, and I still couldn't get to the last nut!
It's no big deal, it will stay in place, but you might have a little rattle/thumping sound coming from that side of the dash occasionally -
I DO! :L