It is presumed (almost certainly correctly) to be its own string - but every part of the craft should probably have been pattern-coded to make it very obvious when it found some stray part of itself; and I imagine that will happen with future missions. What's most interesting is that these events (it found some foil, too) weren't anticipated.

The rover has driven over 5 miles since it landed.

If you pooped in the toilet, and you found it four months later and 5 miles away, you'd think it was pretty remarkable, too.

Thanks for the laugh - I thought the same thing

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