If you have males and females of both species in the pen together there may or may not be cross breeding going on. If possible the different species seem to prefer their own kind, however there is always the chance they might interbreed (they can produce viable offsprings) and that is something most breeders try to avoid.
Box turtles are slowly disappearing from the wild and anyone that undertakes the breeding of them in captivity should consider the issue of normal biodiversity and keep the turtles geneticall pure whenever possible. Who knows, some day the state may come to depend of you to repopulate the state with your purebred box turtles?
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Tess
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