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ah, there are identification papers. I assume the Empire of Seven Dragons had that too? I'd have invested in a fake one if I knew there are such things, I#d rather not identify my heritage given my jailbreak plans
As someone else who's running Sandbox, my experience is that one often forgets to mention things about the setting the PCs are supposed to know. It's a hard to fight trap, getting worse the more complex and nonstandard the setting is. My old group for example had no idea their city has a giant colliseum after half a year of gaming. The current one only knows about 3 or 4 of 36 noble families in any detail, most others didn't even get a namedrop although they are supposed to be a big part of the setting and a frequently talked about topic, but I can't really give all the relevant and known facts without writing 10+ pages.