I've had plenty of background checks. Not once have I ever been asked to provide divorce documentation. I've had security checks as well. Have I been asked if I'm divorced? Sure. Never have I needed to show someone the details of the divorce itself. It's not my employer's business who got what in the divorce.
So let's just flip this. Why have you been asked, and what were they asking to see? Proof you are divorced? Did you claim something that you were awarded by the judge and had to show proof of it? If someone is asking for that kind of information, did you not ask why they needed and get an answer? It would be much easier if you just explained your experience as it is the outlier here
