My personal file is stored in the local social security service center?

Your file will not be discarded. Don't worry, the social security service center only has the right to keep files, but not the right to "scrap" files. They will give you a card when you go through the relevant file procedures and ask you to pay all the file storage fees. Otherwise, if you don't go through the relevant formalities, it will be very troublesome for the trustee to hand over, and you should also bring your ID card and file keeping certificate.