I'm sorry I might have been misunderstood with what I wrote (was getting a bit emotional there), but what I am missing is not a cartel item and is the Imperial Assault HK Customizaton, so it isn't available in the collections tab. As I titled this thread when I started it.
My question was, there are some people who reported that they were missing their own "Imperial and Republic Assault Droid" skins and was able to produce a screenshot of it. Which eventually lead the cs to mail them back their "Imperial and Republic Assault Droid" skins. This is what I wanted to have confirmation on.