You can roll them in borax if you wish, just remember that borax is a drying agent and if you pack them in too much when the eggs are already quite dry and store them for a long time, they will turn out hard as BB's.

Something else egg curers should keep in mind ... the granule sizes you get from bulk borax seem to be smaller than what you get in the 20 mule team box and (I'm guessing here ... could be formulation too) seem to dry eggs more. Stick with one type if you want consistent results!