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Dear Mark -- thank you for contacting History Hub!
I searched the CIS congressional committee hearing indexes for both published and unpublished hearings, but unfortunately I don't see anything to indicate that Richard Garrett ever testified before Congress.
Next I checked in the private claims indexes of the House and the Senate and found that Garrett submitted a variety of petitions in the 42nd and 43rd Congresses. These were referred to the Senate Committee on Claims, the House Committee on Claims and the House Committee on War Claims.
The House Committee on War Claims finally reported adversely on the claim in 1874. More detail can be found in House Report 743, published in the 43rd Congress [8 pages]. The report can be found via ProQuest Congressional, a subscription database available at National Archives research locations.
I checked our holdings and found Garrett petitions in the records of the House Accompanying Paper Files in the 43rd Congress (HR43A-D1 Box #16) and in the records of the Senate Committee on Claims in the 42nd Congress (SEN42A-H3 Box #104). We also have several minute and docket volumes from the House Committee on Claims and the Committee on War Claims in the 42nd and 43rd Congresses.
You are welcome to view this material in the research room at the National Archives building in Washington, DC. To arrange a visit, please contact email@example.com.
If you're interested in the papers of the Military Commission established to investigate the Lincoln assassination, the records are part of Record Group 153 -- Records of the Office of the Judge Advocate General (Army). I would invite you to first search in the National Archives Catalog, and then for more information, please contact firstname.lastname@example.org.