i have fairly extensively planted enclosures myself, and only once can i say that i have failed to find a pair of eggs. it was most likely because i wasnt expecting eggs out of my pietschmanni at all, i hadnt observed any breeding or anything. youre best bet is to keep a close eye on your females, you can often tell visually when they're gravid and as long as you keep your eyes on them daily, you can tell when they've dropped eggs. it takes a good long time for females to lay their eggs too, so if one disappears suddenly, look harder for her cuz chances are she might be hiding to lay her eggs. good luck