If such a regulation on tagging meat in the freezer existed, I would think it would be covered in the DNR manual or searchable online. It is NOT in the 2009 manual, nor can I google it up with many combinations of search terms found.

If you can find a reference, we'll believe you. Otherwise, it's an urban legend.

LEO may say many things meant to mislead you into thinking they know things or can find out things that they can't. Or, judging from my experience with MI-DNR, they may not even know their own regulations. There's a guy that has posted in detail on this site (including scanned letters from MI-DNR) where they basically tried to ruin his life for shooting a piebald deer that their own biologists certified was piebald, claiming it was an albino.