Stew:
Thank you, point well taken. As I indicated earlier, I accept the likelyhood that Jesus was a historical person, and even that the Gospels attempt (through a certain prism) to recount what the author believed to be the life and mission of Jesus. The point I inarticulately was trying to make is that the existence of the the box does just, and only, what you indicated: that at best, and if authentic, it merely confirms that there was a man named James who had a brother called Jesus and a father named Joseph. And, archeologically speaking, the fact that Jesus' name was on the box might indicate that someone, in some context (and this is very unclear to me, as noted above) may have considered Jesus an important enough figure to recognize him on the box as James' brother.
It, however, seems to me that this says nothing about why "Jesus" was important -- for miracles? For standing up to Rome? For being a preacher? For being the Messiah? For being the founder of the family business that James ran (i.e. the church at Jerusalem)?
At the same time, it isn't any alternative confirmation of the working of miracles, raising from the dead, etc. It doesn't confirm crucifixtion or resurection (indeed, notably silent...why not James, son of Joseph, Brother of Jesus who arose from the dead...." that, at least would put why Jesus was "important" in context). It doesn't confirm mission, or occupation (maybe, Jesus was recognized as a really important carpenter...I know, that is facitious, but it does underscore that we know little/nothing about the circumstances of the creation of this box, if authentic). All it confirms is that there was a man named James with a brother named Jesus. It doesn't tell us, for example, that in the niche next to this box, was another empty box, with the words Jesus, son of Joseph and brother of James (again, facitious, but also pointing out how, where, etc. of the finding of the box are not inconsequential to determining authenticity).
Finally, as there really is not theological truth about Jesus that can be gleaned from this find, I do note, like some others have, that the box indicates that James was the brother of Jesus, it in no way indicates that Jesus was considered the messiah by his brother or James' contemporaries (i.e. ...brother of Jessus, King of the Jews and Annoited of God" or whatever the appropriate phrase for the messiah would be...).
Anyway, it is a facinating archeological story, and one well worth watching.
Stew, what is your understanding, is it similar to mine and that James, too, was martyred? If he had a box, why wouldn't Jesus have had one also -- other than not enough time to prepare one, of course

. Might there have been a box for Joseph too (I wonder if families were burried together?). The problem with archeology, of course, is that it only tells you/confirms what you find, it occasionally tells you something about what you don't find, but often as not, that is speculative.