Eligible families should to keep their pandemic electronic benefits transfer, or P-EBT, cards even after they use all the money, Boston officials said Monday. The cards provided food support to families with children who could no longer receive free or reduced-price meals in schools because of closures prompted by the COVID-19 pandemic. They were part of a federal program administrated by the Massachusetts Departments of Transitional Assistance and Elementary and Secondary Education. Boston's Office of Food Access issued a statement Monday reminding families to keep the cards. "As (Boston Schools) continue to adapt their learning model, more funds may be added to your card," officials wrote.