They could have been present in the initial packaging.  I took the marinated clue that it was repackaged. 

No I didn't take it back.  I threw it out.  I don't usually shop at that store and was just on my way back from another town.   I will never go to that store or its chain stores again.  I would suppose this would be the same thing most people would do.  I don't like carrying rotten meat back to the store because usually I just don't have time or want to keep the smelly stuff until I have time to go back.  I might just do it if it happens again.

They may have sell it or smell it to me but they lost me as a customer forever.