First of all, a huge welcome to you and Gizmo.
WELCOME TO YORKIETALK
Here are a few of my random thoughts:
Registration papers are only as good as the person trasnferring them to you is honest. A dishonest person can easily forge papers....
If you love Gizmo and are happy with him, then the papers are secondary to having a healthy happy furchild.
Just enjoy your little guy and understand that the breeder might not have been as honest in selling the dog as you were in buying him.