Well..I have noticed a couple parents just ignore them. Every child has his/her own color sticker on the edge so they are easy to find. The first day I had a young parent come in, pick it up, say "GREAT" and then threw it back down. But her husband checks it every time he comes in, so at least it's being checked!
Also, I put them on the table beside our sign-in/out sheet so they are right in front of their faces instead of in the kids' cubbies. I just was tired of getting texts and calls all night asking if a kid pooped or what/how much they ate each day...Figured this would take care of that!!