Deciphering Item Identification Bonuses

I am wondering if the items made by maker skill can be unidentified at first?
Or you must use a potential scroll on it to become unidentified?
Also is it possible to cube a maker skill made item to unique class?

Thanks in advance!

Maker'd items never comes unidentified, you need to use a potential scroll. Once you have, it is just like any other potential item, cube away for unique.