Go to Uniglobe. Follow thru as if you were going to purchase a cruise. You can find out number of cabins left in each category except that it only gives you the 7 best of each cat. You can put in individual cabin numbers to check all but that is too time consuming. As long as you remember that mid sells before aft before fore, you can get a good idea of how the ship is selling.
"Carpe diem quam minimum credula postero"
Seven Seas Explorer - Miami - Venice - Mar 2017
Silverseas Explorer - Arctic - Aug 2017
Seven Seas Voyager - Rome to Beijing - Oct 2017
Seven Seas Mariner - Lima to Buenos Aires - Jan 2018
Silverseas Explorer - Siberia - Jul 2018
Seven Seas Mariner - Australia Circumnavigation - Dec 2018
All on line booking engines that have real time inventory will show the best 6 or 7 available cabins and whether or not a guarantee is available in a particular cabin. Remaining cabin itinerary is privileged commercial information that is not available outside of the cruise line itself. There is no location where you can find it.