Good idea, they sometimes do go back and lay more, not often I don't think but sometimes. Our beardie we have now was surrendered to us as a "male", which we suspected was untrue, but the way her tail was shaped and her overall chubbiness made it really hard to say for certain. A couple weeks after we got her, she started digging, but before we could get a box set up for her, she dumped 16 eggs under one of her hides. She had been kept alone since the previous owner got her as a baby, so we knew they were infertile. She became much sweeter to us after that, and is now an educational animal for our reptile society!