hmmm....no FORDEC in that decision..just leave them stashed in the flight deck, and advise the outgoing crew...
are you serious?
there's a fair chance they'll say, "no thanks", and give them to German customs/police, you'd be better off doing that yourself. And as Airbubba said, if they would bring the bullets to the US, then they're not only illegaly importing bullets into the US, it will also be obvious to customs someone illegaly exported them...better just tell it as it is immediately, and admit a mistake, rather than trying to be clever