OK
Bill Tindall, E.Tn.
Consistent with your theory we have to allow that this may be the first piece anyone has ever seen that had a lock on the upper left drawer and not a matching lock on the upper right.
And, whatever sort of escutcheon was originally covering this key hole left no evidence of attachment, or there never was one. see PIC

I think the line and berry decoration was scratched before the repair because the line does not pass through the patch. I am unable to use this information to judge the time line of the fix.
In this region of furniture drawer border stringing usually was interrupted by the drawer lock escutcheon. But I have never seen an escutcheon interfere with the line and berry decoration(I have a thick book on this region that shows all the known furniture the author was able to photograph).