You ought to know how many vacation weeks you have, and which weeks you selected. As for the sick pay, in my area we accumulate around 6 sick days a year, and can accumulate up to 480 hours before the company starts automatic pay outs. I know that is not the case everywhere else, so how you accumulate sick time and how it is paid out will be determined by your local or regional language. As for optional days (personal holidays, rover days, whatever you call them), in my area again, they can be combined together with a sick day to get an extra week of vacation.
I think you just need to make sure you are actually still on the books while this time is paid out, rather than being paid a lump sum for money owed upon your official retirement date. The obvious advantage to staying on the books is continuing healthcare coverage.