You can try a couple of things to see if a page is indexed:
1. Try the "site:domain.com" search. This search will enable you to see which pages aren't indexed.
2. Try using the "site:domain.com/page.html" command to see if a particular page is not being indexed. You can also try "site:domain.com/directory" to see if any page within a specific directory are not being indexed.
3. Try Google Analytics. Try seeing if one your page hasn't received any clicks (organic visits) at all. If that is the case, your page probably hasn't been indexed.