How do I get proof that I don't have a High school diploma or Ged

Is there a reason you need to prove you don't? That's a serious question.

You get a copy of your school records from the high school district you attended. It will show your missing credits, and no record of graduation.

In general you don't prove you don't, you prove you do.

But as noted, you get a copy of your school transcript showing that you failed or dropped out of school.

It's almost impossible to prove a negative. The suggestions offered above would help prove that you didn't finish high school in your school district, but don't prove that either (a) you never graduated from another district, or (b) you never earned a GED. Your request is highly unusual - what's the reason for wanting to prove that you have never graduated?

I really don't understand why you would have to prove that you don't have a high school diploma. Most times you have to prove that you do, not that you don't.

Who is requesting this proof, and why?

This is a very odd question.