The records are manuscript volumes. There is one letter book [CCE512] which includes copies of outgoing letters of the committee as well as of the Board of Experts itself, along with original letters received by the Board and related newspaper clippings.

The other two volumes [CCE460] appear to be record books maintained by the Experts during the course of their investigations. Both of these volumes include references to individual warrants issued for payment of municipal expenses, with references to the ordinances or resolutions authorizing those payments. They appear to cover expenditures for the years 1852-1853 only, and were probably created during the first year of the Board's deliberations. The first volume, Statement of Experts [CCE460] lists warrants in chronological order and describes each briefly. The second book, the Experts' Ledger, arranges warrants by the ordinance or other authority for payment and, to a degree, provides more detailed descriptions.