ID tags are usually brass, aluminum or thin metal. If its a tag we cant read it, so we cant ID it. Unless this item was found on a battlefield or something, its for the junk bucket.I don't think it's Says anything
I think you got it and they are steel. Conduit outlet body covermaybe something like this
https://www.standardelectricsupply....ct.and.Cable.Trays,Enclosure.plates.or.covers