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I doubt they're from other systems. Long time and distance to other habitable (pick your criteria) systems.

If they're from other systems, they're likely uncrewed and fully autonomous. The same thing we may one day attempt, if we make it that long.

Interesting question: What if the goals of their civilization have completely changed since launch? It's likely been a long time.

Will we account for that when we launch?

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It's an interesting question. I think there is something in distance + time + technological advances at the source? If you advanced your technology, in theory your new stuff could literally pass(collect) your old stuff? I think if you're intellectually advanced enough to send what you suspect will be a successful mission to another system, you can kinda reason through aborting/changing it based on the advances you might make in the time it takes to travel? Not sure that makes any sense.

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