Residente Permanente

I have seen some information regarding the Residente Permanente, which I applied for and received 10 years ago, but am hoping to get advice on my situation. I am going from San Diego to the Tijuana airport, and flying to Zihuatanejo on Tuesday, where I have reserved an apartment. However, my Residene Permanente and related papers are all missing, after I had a suitcase stolen a while back. Is this still valid without problems, or should I allow extra time at the airport before the flight leaves to check with the Mexican authorities, or wait until I get back to Zihua and deal with it there? I hope it is still valid, and that the information is still in the system. I would greatly appreciate it if anyone has any suggestions ????