I used a sharpie to write my UPIN on the back of my CC permit (just a number, not any info what it is for). I'm not sure why the OP thought he had to report this to the FBI. The UPIN is just an additional identifier associated with your name. It's not like someone can use it to purchase a firearm unless they look just like you and have a driver's license with the rest of your information on it. Most folks wouldn't even have a clue what it is for, including some FFL's.
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