“There is a poster on this site that has info from an EMS person who said he saw a lot of 5.56 casings”
Ummm... .223 and 5.56 casings are identical.
No, they aren’t and law enforcement should know the difference.
That information has been provided to that one. You can lead a horse to water, but you can’t make him drink. Don’t waste your time is my recommendation.