Chasing obscure directories is less valuable than fixing the three sources ranking systems actually read.
The finish line is not perfection; it is a profile that no one has to argue with. Simply as important, practitioner surveys show the gap between a tidy profile and a neglected one widens in a crowded metro market. Verify by phone or postcode lookup, not by memory. A business rarely disappears from local results overnight; it fades as its records go dated. Voice assistants rarely announce a penalty here — they simply rank a less certain record lower, assuming the basics are already in place.
Record the canonical version of the list of services somewhere the owner can find it, at least in a competitive market. For estate agents, discovery still begins in a map or a directory more often than on a homepage, once the obvious errors are gone.