I allow toys from home and most of the time I give them back the same day or some days after and it's not a big deal for parents. My only policy about it is that I am not responsible for lost or broken toys brought from home.

You could also make your policy not to bring toys from home and enforce it or I take them away as soon as dck arrive and give them back at the end of the day, for the trouble making families. I wouldn't be driving myself crazy at the end of the day looking for toys.