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Redditor finds heavy block of iron shavings inside cheap PSU, also appears to lack safety protections
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
~~There legitimately aren't any, so no, I doubt they were asking that.~~ Derp, yes they were, context is important kids! Leaving the rest of my original answer, as it's accurate:
In some handhelds, you might see small counterweights added to make them easier to hold for long periods, or to stop them tipping over when in a table, but for internal components (like power supplies) there's never a need to add weights.
That's definitely what they meant, I don't know why you're so certain otherwise. Just because a question doesn't have an answer doesn't mean it wasn't asked.