I don't know if I'm having one of my hyper-literal moments, or if this is some other neurodiversity thing, but I can't make sense of the last paragraph... Can someone help explain it to me?

The way I read it is:

* 219-09-9999 is a made-up number that was never issued to anyone.

* The woman thought it was her number for unexplained reasons.

* She used the pamphlet as evidence that it was her number.

I must be missing something important. Is it a joke, with the punchline being that she thought the pamphlet was her social security card? If so, how was this the fault of the Board? Was it her SSN somehow? If so, how did the pamphlet prove it?