I assume if this is from registered mail, this is not an actual CIC processing agent and more like a member of the admin/secretarial staff. Quite possibly someone who doesn't want their entire name posted on a public board!
Your local office has much more impact on processing time; and luck. Because almost every office I've seen has had a post(s) made about it being the slowest. All offices can be slow, and all offices can be fast. Sure the ones in less populated areas may be fast but no guarantee. Also no guarantee being in a low area means you'll get a fast AOR and that your application will even get to that local office quickly.