The 787 does not use quick release fasteners. Almost all panels are secured with titanium countersunk bolts (or screws, depends on your definition).
That's interesting. So presumably, unlike a Dzus-type fastener which normally stays attached to whatever it's fitted to, the screws* that attach the panel in question aren't captive, i.e. when released they are then free and would normally be collected and bagged ready to refit the panel later ?
So, if we believe the accounts that the panel was refitted to the aircraft after removal, but with considerably fewer than the correct number of screws (which I'm still sceptical about), that begs the question of what happened to the rest of the fasteners, and why any sane AME would fit just a few and not the remainder..
* in the days when I used to get my hands dirty, a screw was anything that you tightened or torqued by applying force to the head, as opposed to holding it still and winding a nut on the other end.