I would have sent it back if I felt that the knife was a poor specimen for any reason. We spend too much on knives these days (for the most part) to accept poor quality knives. The only aspects I will correct are the ones I have for 50+ years, and that is to re-edge and sharpen the blade and apply a high grade lube.
I have sent back a few knives and I am certainly not a perfectionist. My knives don't have to drop shut, they blades don't have to be perfectly centered, they don't have to be made of components that allow me to disassemble and "maintain the knife" every couple of weeks, etc., etc. I like a good solid build with good fit and finish and generally speaking I am happy.
That being said, I have sent back Cold Steel knives (one being a Code 4 that literally would not OPEN), a Spyderco that had a blade that opened easily but the last 15% or so was so hard to move that it wouldn't lock without a lot of work, but then was impossible to safely unlock. Sent back a Queen traditional that wouldn't close all the way to have the liners/scales cover the blade edge and point, an Ontario RAT5 that had the wrong scales on it (!!!) that was purchased directly at Ontario as a closeout, a folding traditional AG Russell that was ground so poorly it didn't look like the knife it was supposed to be. There have been more. But every vendor told me the same thing: "Whoops... sorry. This stuff happens, we don't check every single knife before we send it out. What do you want to do?"
The point being that no matter what knife you buy, regardless of who manufactures it, not every piece is their best effort. It's that way in all manufacturing. Just because it is a lemon doesn't mean it is a fake. Cause for suspicion, but I wouldn't drop to conclusions.
I have a good friend that is a Benchmade authorized dealer, and he is the same way as the vendors I referenced above. If there is a problem, he likes to snuff it out at the source and make things right. He is a knife guy, and has been honest with me that things are a little irregular at times with his product, but he stands behind it 100%. Rather than anyone torturing themselves trying to decide if they got "had" from any vendor on any knife, I always tell them to call the vendor first, then if not happy with the response, send it back no matter where you bought it.
Robert