MSP "guidance" is a pathetic substitute for actual law.
Bona fide is Latin for good faith. IMO two pistols does not make a collection, but my definition is not law either.
If push comes to shove, and the legislature is not interested in defining the terms they create out of their vaporing, the courts will have to determine the meaning.
What is, is. What "is" means is up for grabs.
There may be better ways to structure the law, but sometimes shelter can be found in ambiguity.
Which is why MSP "guidance" point out that the law regarding the DC letter does not include bonafide collector.