You may well be right, Romilly. But I'd contact Philip Rogers at the Coroner's Office, Civic Centre, Oystermouth Road, Swansea, SA1 3SN. He is the current Swansea coroner. I understand he recently deposited a lot of 19th century inquest records at the West Glamorgan Archive Service.
That being the case I wonder if the more recent records were sent to the WGAS while the older ones stayed with the coroner (until recently). Or has he still got the newer ones?
Worth asking...? Assuming it was a Swansea and district death, of course.
Bernard