Sadly, in the intervening dozen years since I lived there, I have lost track of him. Quit replying to emails about seven years or so ago. Last I heard he moved out of the country.
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My big girl has taken eggs that had small cracks in them that I only found when I took them out of the container. I have also seen a few vids of people that “shave” a layer off the eggs they feed which has been claimed to help reluctant feeders because “they can better smell the contents”. I have heard some people say their Dasy will “drink” chicken egg from a bowl but I have yet to see actual documentation of this behaviour (Oligodon will absolutely do this though)
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I have heard people say that feeding store bought eggs for extended periods is detrimental because the eggs lose biotin over time sitting on the shelf. But my big girl is at least seven (she was an adult when I got her six years ago) and I have not noticed any issues having fed her exclusively off quail eggs from the store.