Could be an anti-shoplifting tag for retail environments... or Amazon distribution centers where employees are required to pass through screening before leaving at the end of their shifts.
Congratulations on a great teardown. Nice pictures.
It doesn't seem to be connected to the other boards in any way.
I'm tempted to suggest an RF tag used at the factory during manufacturing processes, but why two?
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
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