First question I’d want to ask is this: was it common to also list the name of a brother on such a box?
They only have one other incidence of it and they think it was die to the brother in that case being very important.
“Professor Camil Fuchs of Tel Aviv University stated that, other than the James Ossuary, there has so far only been one found, amongst thousands of ossuaries, that contains a reference to a brother, concluding that “there is little doubt that this [naming a brother or son] was done only when there was a very meaningful reason to refer to a family member of the deceased, usually due to his importance and fame.” He produced a statistical analysis of the occurrence of these three names in ancient Jerusalem and projected that there would only have been 1.71 people named James, with a father named Joseph and a brother named Jesus, expected to be living in Jerusalem around the time at which the ossuary was produced”.