In this matter, I would like to think that we better all subject ourselves to the famous excutive order "DON'T ASK, DON'T TELL" that start by dear former president Mr. Lewinsky.
Interprets in orchid language as followed:
Rule no.1.
You "DON'T ASK" the vendors at the orchid shows, where he buy his flasks, seedlings, where he grows his plants, how much he bought them for, and all the zillions of paper work.
(Imagine, all the 10,000 of visitors to the Rockefeller center show, Redland show & other shows starting to ask for paper work at the show, geez, just the amount of paper needed to print the Cites/phyto would kill the whole forest, there goes the orchids' habitats )
As long as it looks unblemished & seems to be fed with a Dynagrow diet, you assume you can buy it.
Rule no. 2
The seller may decide that you are a competitor , and not telling you a thing.
The seller may decide that you are an undercover, and not telling you a thing (even if he does not involve in illegal activities).
The seller may decide that you sound like you are a novice and not deserve to receive his precious plants.

If he remember you face, not only he will "NOT TELLING" you what plants he has next time he see you aproach the stall , he will be hiding them for his other favorite customers.