When does my prepaid card get deactivated once I left Macy's?

Unfortunately I have to leave Macy's for personal reasons. I loved working for the company but life in general just happened. I still have my prepaid card and I got a statement saying I still have $85.00 credit in it. I want to use it but I don't know if I still can. I left officially on May 1. Does it ever deactivate once we're no longer part of the company?