Hi There, The page can still be Page ranked by google but still remain in the sandbox. I have had a site do just that and i have heard a number of site gaining PR but still sandboxed. Takes time and good content and back links. Normally 3-6 months- Build your back links slow and steady other wise they take it as spam. Hope that give you an idea!! Cheers Jonny
There should be no relationship between sandbox and PR, since PR is mainly a algorithm of calculating how many inbound links you are having.