Most states have laws that make it illegal to release captive-bred reptiles into the wild, so that's probably not a good idea one way or the other. Three-toed (Terrapene carolina triunguis) and Eastern (Terrapene carolina carolina) box turtles are the same species, just a different subspecies, so this isn't really crossbreeding and the babies aren't considered hybrids, they're more correctly called intergrades. They will interbreed freely, given the opportunity, and will produce fertile eggs. The best advice would be to try to keep an eye on the female, starting a few weeks from now, and dig up the eggs and dispose of them if you can find them. In less-than-scientific terms, the intergrade babies would mess with the local gene pool if they were released in the area.

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