Assuming that you get charged with a violation of Penal Code Section 25400(a)(2), a felony, they have three years to file charges. Assuming Misdemeanor, one year. There are many varieties of carrying a firearm, which can determine whether it is a felony or not, including, was it registered, was it stolen, did you have a prior conviction for this type of charge, did you have a felony conviction. I would make sure your address is current with the DMV and look out for a letter informing you that you have been charged. Then I would consult with an attorney and tell him what happened because you may have a search and seizure issue.