I'd say probably more likely it was simply a relic of their time as slaves in babylon and one of them carried back with them to Jerusalem. Quite possible an hebrew worked as a scribe in Babylon, using the babylonian seal in his work there. Basically it indicates only that as slaves some of the jews held important positions within the babylonian govt. Maybe he was a clerk or something, an accountant, a notary public of sorts, hard to say. It's proof they were in Babylon, it's proof of the name, there is no proof it was used for correspondence after the return to Jerusalem, that is conjecture.

I doubt science class is a good place to teach theology, Linda. Much less trust the subject of theology to public high school teachers.

The evidence and textbooks should have been re-evaluated a long time ago. Why ideas that have been rejected by science decades ago continue to be taught, at a high school level no less without a more comprehensive discussion of history and social sciences, eludes me completely. Except that someone out there obviously desires to dumb down our kids, plant ideas of racial hatred in their minds, and provide them with a very confusing argument to the possibility of creation.