(a) A seller shall maintain the following documents for at least seven years or the length of the conditional sales contract, whichever is longer:

1. (1) A copy of each buyer’s conditional sales contract.
2. (2) Any documents relied upon by the seller to determine a buyer’s creditworthiness, including, but not limited to, any consumer credit report, as defined in Section 1785.3, or any other document containing a buyer’s credit score, as defined in Section 1785.15.1.
3. (3) If the conditional sales contract is sold, assigned, or otherwise transferred, a copy of the terms of that sale, assignment, or transfer.