you have too feel the potatoes...
If they are still hard and moist and no sprouts coming our of violet spots it's no problem.
If you store them in a dry and dark place it shouldn't be a problem to keep them for a few weeks - depending on the sort..
even if they get dry and soft, there is no problem with eating them, but you have to cut off violet spots - however they won't taste that good anymore
and if they get really mold you will smell and see
My Dad keeps his potatoes from about September until the new fresh ones come in in june..