Just to start off, I'm from the uk so American laws and post services don't really apply. I ordered a g of mdma a while ago and it hasn't shown up, then on saturday I got a notice saying that the post man hadn't been able to deliver a package for me because it was too big to fit through my letterbox and that I have to go to the local depot to pick it up. I'm a bit worried that it had been flagged, and they want to watch me pick it up then bust me for possession once I have it on me. Is this an unreasonable fear? Not sure what to do.
CD's are literally unheard of in the UK, I don't think it is something that Police practice at all and you shouldn't have anything to worry about. It likely is a truthful letter, stop your paranoia and go grab your drugs :) no way are they going to stake out a post office waiting for you when you could potentially leave it for days or weeks to pick it up.