All census lists for John Duggan give date of arrival as 1880. I found on 1930 census I think his two brothers Patrick and Michael, arrival date 1880. But I queried the Mass Archives, which have state records to parallel the "lost" federal passenger lists, and they state only one ship arrived in Boston on that date. They even looked at all of 1880, and did not find any John Duggan whose age looks right. THey did opine that young children traveling alone sometimes stated an older age. There are some John, Patrick, and Michael Duggan listed, but not all three or even 2 on the same date and ship! I may request all of these records, just to see if they show any revealing details,
THis may remain as one of the great mysteries on my family tree!!!