If you could find where the dataset is being sold, there's might be a small sample of the dataset being provided to prove it's real, but that would be your only bet, without just buying it all.

Usually here: https://haveibeenpwned.com

No, on first read, I thought OpenAI had been hacked, but it looks like it's a malware thing. I'm not likely amongst the pwned.

But also not joking...every one of my chats really do end in limericks :)