@ddosecrets For those who are wondering about this too: the answer is "no". There is not a lot of cryptographic proof in this release, and what's there is not robust.
The 68 emails supposedly sent by Patel are not signed. Of the 256 received emails, only 153 have a DKIM-Signature header. Given that most emails are well over 10 years old, it's safe to assume that none of the signatures correspond to active domain keys.
For the most used domain keys in this release (gamma._domainkey.gmail.com, 20120113._domainkey.gmail.com, and s1024._domainkey.yahoo.com), it's possible to find some supposed values online, but it's also plausible that the gamma and s1024 keys have already been factored by actors with enough resources, given their popularity, the fact that they're 1024-bit RSA keys, and the amount of time that has elapsed since their implementation.