Soane had long been interested in publicising his work, having put together books in 1778 and 1788. He may have been especially willing to pay for the production of prints of the Bank Stock Office in 1796, at a time when his unconventional style was beginning to come under criticism (A. T. Bolton [ed], The Portrait of Sir John Soane, R. A., 1927, pp. 59-79).
The publisher George Richardson perhaps also foresaw profit in supplying a burgeoning market for architectural and topographical prints (B. Adams, London Illustrated, 1604-1851, 1983).
In any event, it seems unlikely the prints were ever published, since there are no extant copies.