I agree with Hardy. But I'm an experienced bargain hunter so I'm willing to take the risk.
I would not necessarily cast doubt on someone selling tackle who exhibit little clue as to what they are selling. It could be someone selling tackle from a deceased spouse/relative and they are no expert on fly fishing stuff....or the wife and husband going through a divorce and the wife is selling the husbands tackle as payback
I just have a feeling that when people scam items on craigslist, they are more likely to scam items that are the hottest and latest consumer items (e.g electronics). Fly fishing tackle is a very very niche market.
In any case, you always have to be vigilant. It's caveat emptor on the second hand market so it's up to you to decide how much risk you want to take (buying stuff from a distance vice seeing it in person) but for those that are experienced bargain hunters, I just thought this search engine was a very good comprehensive tool to use.