I thought Frank had solved this one but apparently not
All the same, it illustrates the power of the the human brain which is [at present] still superior to AI. There may always be a route somewhere and DNA [just coding?] may be everything. Soon we may no longer be concerned about what we can't remember as the technology will tell us
A recent long lost family program, that went almost unnoticed, solved "impossible" genetic searches by combining the traditional written [analogue] records with DNA searches. These went in the "back door" [as-it-where] by locating family members on data bases that matched via cousins etc . Program Archival identification may have similar options in future as the data continues to build [and build].
Dave W