Some ppl just damage the screws on purpose because it's easier and you won't be using them again after switching grille anyway
LOL...some people...meaning me aye? well, just for ur info, i put back the original grille without a problem even without the screws coz its held on by the top bumper guard. I found there are alot of unesscary parts in the civic...not to say to remove everything, but yeh..EVEN if you break the screws you can get new ones from honda as you have done.

Btw, please return the small screwdriver i lent you asap. Gf'z dad needs it back =P