How does one go about requesting a DNA test on an artifact?

I’m looking to repatriate an artifact (through the Native American Repatriation Act) claimed to have belonged to an ancestor but don’t know where to begin.

Do I take a DNA test? If so, what type? Do I then contact the Dept of the Interior?

Anyone know anything about DNA tests and matches or how to go about doing this?
Thanks in advance.
I’m asking this for a friend. He is not an enrolled member, although his father was.