| Reference Number | Title | Date |
| RBC/34 | Letter from William Keith to Richard Butcher | 31 October 1854 |
| RBC/36 | Letter from William Keith to Richard Butcher | 13 February 1855 |
| RBC/42 | Letter from William Fraser to Richard Butcher | 10 February 1855 |
| RBC/50 | Letter from William Keith to Richard Butcher | 6 February 1855 |
| RBC/53 | Letter from Henry Smith to Richard Butcher | 26 November 1854 |
| RBC/101 | Letter from William Keith to Richard Butcher | 11 March 1856 |
| RBC/149a | Letter from William Keith to Richard Butcher | 30 September 1856 |
| RBC/149b | Letter from William Keith to Richard Butcher | 7 October |