There are definitely some toys that my kids have that are "special" and not for dayhome kids usage. Those toys stay in their bedrooms, which are off limits to the d/c kids except for napping.
If they choose to bring it out and play with it, then they all know that it is fair game at that point. And the same rule applies to kids that happen to bring toys to daycare (which I try to discourage!). If you bring it, you share it.