Hmm, in my experience these tags usually are just postal addresses. They don't contain any narrative of the details of surrender or whatever. They are just tags that identify the owner, and the owner's home address. So in that sense this one falls well within the orbit of most surrender tags.
But I agree with the above that this one seems slightly suspicious because of the sharpness and clarity - although that might just be a problem of perception. And, the tag's veracity/authenticity could plausibly be tested by searching in that location to see if that family still exists, or if any residents know of that family.
Anyway, you are right in ignoring the tag for now and concentrating on the item itself. Extra points if the metal bits (spacers and the tsuba) have the same assembly numbers on it. Extra extra points if that number is replicated on the tang of the sword.
