Posted: Thu May 09, 2013 9:42 am Re: does my turtle have eggs
A tupperware bin is fine.this website says for a larger RES it should be 12 inches deep. So I guess somewhere before that (or 12 inches if you really want) should be fine (I wouldn't go any less then 5-6 inches).
My nesting box is outside of my tank so I don't know how to make one inside. You could ask in the indoor habitat thread how to do it.