Lately I have been seeing these old reproduction patches surface as originals. They have been in the US for around 40 years. I first saw them in the early 70's. Most do not glow and are make of period(non-synthethic) materials. You can tell most of the time by the construction.
These patches were picked up at the SOS for the past few years. They are sold as reproductions at around $3-$4 a piece. These are all reproduction! No stories about a hoard being found after the "Wall" came down. Not found in a crate in an abandoned factory. These were purposely produced 40+ years ago for the collector market.
I hope this helps.