Sorry I took so long to reply. Long day at work, and very difficult to photograph with UV light.
ISSUE SOLVED!

Of course, it wasn't anything special. The stamps are shown below, but what is difficult to see is that the non-tagged parts are covered with TAPE right down the middle, which is UV lamp resistant.
And the ones I thought were un-tagged actually had a very small amount of tagging visible in various areas.
So, sorry for the excitement. On to the next problem ...

