(a) Licensees shall keep the records required by The Act for the later of four years or the resolution of any outstanding complaints.

(b) For all purposes associated with enforcement of The Act, the licensee's retention of each document required by Food and Agricultural Code section 56273.1 is prima facie evidence of a complete account of sale, but partial absence of such documentation is not conclusive evidence that the account of sale is incomplete. If the absence of documentation arises from factors beyond the control of the licensee, the licensee's testimony may be sufficient substitute for the documents themselves, and the resulting record may be considered complete.