From a substantive perspective, you're thinking of a different area of the DMCA, for noticed related to copyrighted works. The RIAA notice at issue here was based on 1201, for tools used to circumvent copyright, and so it's not necessary to disclose the works being violated.

From a formatting perspective, format is generally irrelevant to notices like this because the law does not state a particular format must be used. Thus, any format which conveys the necessary information is generally acceptable.