Not being there and all........sounds like you've been pretty thorough.
The way I read the spot test is like this:
If one were testing for LSD - the LSD would have to be laid out on some type of filter paper - or blotter paper in order to see the reaction.
I wasn't sure if you could test the mushroom flesh itself
If one would have to do an ethanol extraction of the fruitbody to create a suspension which could be "laid out" on filter paper or blotter paper. (Like one would "lay out" liquid LSD)
I dunno. If you can perform an extraction, it would be another cool test to perform - just to see if you get a different result.
Just throwing out ideas.
I'm curious. How much reagent did you purchase and for what amount?
Does it have an expiry or shelf-life?