You can just dig the eggs up - you are unlikely to harm them as they are hard-shelled. Just put them back in the same position you found them in (or, if you find them within ~24 hours, in a different position) in a smaller container, with a pencil cross to mark the top (so you can put them back properly in case you would ever move them).
I have had 8 clutches from one female last year - a lot!! 4 from the other. They usually comprise 4 eggs, but I've had 2-5. They have started laying a month ago, second clutches are probably on their way!
Mind you: females will only lay in substrate that has the right humidity...if you see a female sitting on land a lot, try to humidify the substrate (or allow it to dry if it's too wet). The right humidity is hard to tell: te sand should just not collapse, which is the amount of moisture that is in the sand when you buy it bagged (at least in Holland ).
Hope that helps.

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