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Yes – the nose is your guide! Unfortunately the meat under that material will not be dry aged as much as the rest of the meat since that material has acted as a moisture barrier. The foreign substance issue in your case tells me the meat was not purchased in a cryovac bag, but rather had been repackaged by the store where you purchased it. Typically that CAN mean the meat had been subjected to bacteria, but at 25 days into it my guess is you dodged that bullet!