Are these 2 operators a realistic idea of where your site may be in the serps for a given search if you are sandboxed? I'm in the sandbox for a particular terms that generates 68 million results. So my site shows up nowhere at all for this keyword. Using both the operators above the site is on page 5. Is this an approximate position where the site would be in a normal search if it wasn't sandboxed?
no, it does not give much idea about your serp position, because you are using a kind of filter to search.