Actually artificial incubation with box turtle eggs isn't that hard if you have a warm room (ie turtle room thats kept warm). Sadly I've had very little luck hatching box turtle eggs on or in soil as it doesn't seem to give the eggs enough access to air (oxygen) as the embryo grows. In the nest chamber would be fine if it was a well formed chamber that the filled in dirt was only loose around the egg/s. Also all box turtle eggs are slightly hard when first laid. They will expand in the first couple of weeks and get more leathery.
Danny
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