[Christ]

Carlos, not sure if you figured out something for the flush mount screws, but you can get furniture screws from a hardware store (ask specifically), and just fold the teeth back over on them with a hammer and some light taps. They're usually square, but also come round at times. They're nuts, not screws. You would normally drill a hole in the wood, then tap/glue them into the hole, and the little teeth that are just folded sections of the body would then bite in on the plane perpendicular to the screw's insertion. They're commonly found on furniture with removable feet, such as sofas and ottomans. They're easy to remove with a slide hammer, as well, and can take a good beating.

I'd also chance a guess that the "binder" quality screws would hold up pretty well, too, as long as you kept them away from salt and such. You wouldn't believe what paper can do to a screw if it's dropped, thrown, etc.. and I've personally seen those screws take some abuse.