Obviously the consensus is that you did the right thing by not trading. I am very easy to trade with and as a lot of you know I have done my research on scrappers and counterfeits but nobody can know every pin, and we have mentioned and I have posted about how good counterfeiters have gotten.
Too many people jump to conclusions and think they have a scrapper for a minor flaw. Believe me there are plenty of flawed Real & Genuine pins on the racks right now. I have never had it happen but in the event I acidentally sent a scrapper or bad pin, if the person communicated I would gladly take it back and trade something else because that is what I would want if it were the other way.
I appreciate when people let you know up front that they are not sure of a pin. I had a trade where the person had a pn max really wanted but they thought it may be a scrapper. Because they informed me of this, we altered our trade fairly so regardless, each of us was happy with the trade, but if I had traded the original pin I may have been dissappointed.
COMMUNICATION! Thats all there is too it but like Tabbi and others have said, its a hobby. I am not selling a picaso or rembrandt or something or a flawless diamond, its a pin and even on the rack, it is rubbing on other pins. Perfect mint is a tough thing to call.