What are the chances that the deal you found on Amazon involved counterfeit goods? That’s been a big problem with audio and electronics on Amazon recently.
People say it's a big problem but to date, having bought in the low five digits of audio and video hardware mostly from Amazon, I've had zero (obvious) counterfeits and very little defective gear generally, all of which was manufacturer sourced.
I'm sure that counterfeiting is a real problem, but I don't know how pervasive it actually is.