Although some of the entrants in the missing Largeworkers Register 1758-1763 and the missing Smallworkers Register 1738-1758 have been identified, there are still many unknown.
As for the fate of the missing registers, investigation by the author and silver expert John Culme concluded that the registers were likely lost in a fire when they were stored at the temporary London Assay Office on 29 July 1830, during the construction of the present Goldsmiths' Hall.
See: 'Trade of fancy: new findings from eighteenth century London' - The Silver Society Journal, Vol. 12, Autumn 2000, pp. 98-110.