19 CFR §115.12

1. (a)Each Certifying Authority shall maintain—
   1. (1)A copy of each individual certificate of approval issued, together with a copy of the plans and the application to which the approval refers, along with any information submitted by the manufacturer and/or owner or operator for the certification of a container or a road vehicle.
   2. (2)A record of each serial number assigned and affixed by the manufacturer to the road vehicles and containers manufactured under a design type approval, and containers approved at a stage after manufacture.
2. (b)The Commissioner may examine the Certifying Authority's files required by paragraph (a) of this section.