My bike's better than me!
Join Date: Feb 2005
Location: Northern Colorado
Posts: 2,041
Bikes: (2) Moots Vamoots, (1) Cannondale T2000 tourer, (1) Diamondback Response Comp mtb
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The metal in the bb shell (ideally) could mean the shell had been faced and chased -- a good thing.
Surface rust on fasteners isn't a big deal, though it's avoided with application of grease to the threads prior to assembly.
What (else) has you believing that it wasn't assembled properly? In other words, exactly why do you want to return it?