If you look at this top row of holes and number them from left to right 1 through 7, then the first two holes (1 and 2) look a bigger than the others.
The bush is behind hole #1, and you can see quite a bit of it. My guess would be that the there was a screw in hole #1 temporarily holding the panel in place - and that screw is still with the aircraft.
Hole #2 also looks a bit larger than the next 5, so maybe there was a screw there as well.
Or, perhaps holes 1 and 2 took bigger screws. But even at that, hole #1 looks pretty big.