Hello gentlebeings, I need your help with something. Don't know much of the terminology, so please bear with me. Nearly fifteen years ago, I bought an IG-88 (the silver variant) from my local comic store. What I didn't notice at the time was that it had two right arms. Having been young at the time, I was disappointed that it wasn't "correct" and eventually purchased a normal IG-88 later down the line. Now being an adult, I've realized that this thing could be valuable, or at the very least rare collector's piece. Are factory errors like this common? How would I go about getting this thing valued? Thanks in advance!