one of the points I make in the article is about trusting the information you get when acquiring new fish. I may have given the impression that false information usually comes from untrustworthy people. that doesn't need to be the case. I recently got a group of Theraps wesseli from a longtime German friend. he told me that they came from another (mutual) German friend who had collected them at the type locality. an article on the collecting trip was published in DATZ (a German aquarium magazine). so I was able to check it and see pictures of "my" fish as they were freshly collected. that was cool.
then, for another reason I contacted this second friend and told him I now had his fish. he surprised me by telling that they were not from this collecting trip but instead were bought at a Dutch LFS. the status of my wesseli group changed considerably. most likely they now are aquarium bred and not wild caught. unknown provenance for sure.
I have known these two German guys for ages. I know I can trust them. but still I got the wrong information. for me it only goes to show that keeping track of the provenance of fish is practically impossible.