When you’re asking for help and published experts in the field are willing to help you, being snotty is the best way to guarantee they won’t help the next time.
Considering that there are only 10 of these known to exist, getting confirmation here would seem to be the most important reason for posting it, don't you think?
I would not start there- I would research it a bit myself and have a better understanding of what I was going to have slabbed... Does the edge look similar to this?