I use a nest box with my lace monitors (and have done for many years) because they are pretty much obligate termite mound nesters in most of their range and it's easy to replicate the conditions in a termite mound using a nest box.

I wouldn't do the same with a medium to large ground burrowing species. Have you tried it with any largish non-odatria species? My only experience with breeding ground burrowers was when working with perenties a few years ago and the extent of the nest burrows the female made would have precluded any nest box.