ok this might not apply to this but last year in band (yeah go ahead call me a band geek but no one does cause im 6-foot 2-inches and only in 8th grade so no one messes with me exept my friend johny who's just as big) and we threw drum sticks into the celing tile (you know the little crappy tile things they use cause their cheap) we threw like 50 sticks and a cymbol up into one and it fell down. so we freaked out, me and 3 other drummers, and just put the pieces back up and (well you know where this is going) didn't work we ended up getting suspended for 3 days and i had to replace the tile cause we had just finished off our basement with the samne tiles.
even if we did confess we would still get suspended for 3 days but it would be a lot less hard so just tell and replace it.