quickest/easiest first step test way to see if something's anodized or not is to grab the mother's polish and to a test spot on the part somewhere non-conspicuous. If the results of a little polish is that it looks slightly cleaner - it's likely anodized. If you make the part shine, it's not. Giving the part a good polish while conserving the logo may be difficult depending on how "on there" it is. Suppose you could mask off the lettering, do the majority of the polish, then very gently polish around the lettering to prevent too much removal of the paint/whatever it is they used.