What do you want to bet it uses stuff like your SSN to verify?
[1] https://help.equifax.com/s/article/ka137000000DS9XAAW/What-d...
> Please provide proof of identification, such as a copy of your driver's license, passport, birth certificate or other proper identification forms.
Given that the hack included name, SSN, date of birth, and address, a fake copy of one of these should be incredibly easy to generate.
edit: Driver's license numbers were also leaked in some cases. Fun.
http://www.highprogrammer.com/alan/numbers/dl_us_shared.html
"If you lose the PIN that was issued to you when you added the Security Freeze to your credit file, you may request a new one in writing. Please provide proof of identification, such as a copy of your driver's license, passport, birth certificate or other proper identification forms."
[1]: https://help.equifax.com/s/article/ka137000000DS9XAAW/What-d...
A question that came up among my coworkers and I was: given the nature of the data that was accessed, don't the thieves already have all the info needed to unfreeze your credit?