I have reported many posting violations so far from many different users - such as multiple posts in the same thread. In these cases - when moderators deal with it, they always leave a note written in red at the end of the post like "this post has been merged by mod xxx".

I don't think mods send notification to the offending user - unless their post is deleted. Just like if one of your thread is moved to another board - mods don't send notifications. Someone from the mod list may be able to clarify that information for you.