A permanent resident card stops being yours in three situations: you become a citizen or otherwise lose permanent resident status, the card is lost, stolen or destroyed, or you have died. Reporting a card lost kills that card, so one that turns up in a coat pocket later is no good to you.
60 A permanent resident card is revoked if (a)the permanent resident becomes a Canadian citizen or otherwise loses permanent resident status; (b)the permanent resident card is lost, stolen or destroyed; or (c)the permanent resident is deceased.
60.1 (1) The Minister may collect the social insurance number of a permanent resident card applicant or a travel document applicant to verify that the applicant has complied with the obligation set out in section 28 of the Act. (2) The Minister may disclose the social insurance number of the applicant to the Canada Revenue Agency for the purpose set out in subsection (1) if the Minister has entered into an arrangement with the Agency for the disclosure of that information.