Is it possible to reopen the locker after accidentally closing it too early?

Yes, the app allows you to reopen the locker. If you do not confirm collecting the parcel, the "reopen" button will be available. The same applies when the connection with the locker is not terminated. If you confirm collecting or sending the parcel by mistake (e.g., confirm collection in the app without taking out the parcel), contact the technical support for DPD Polska parcel lockers at 22 571 52 52 (call costs depend on your phone tariff).