eBay claims no financial information was accessed.
Please change your password!
Make sure your payment plan has a different password and is not auto-linked. And, do not keep your credit card/bank information "on file".
As a victim of this type crime, via my phone company (Verizon), "they" don't need your financial records. They just want to log in as you, win a small bid and pay with PayPal, which likely has the same login and password, or is linked (for convenience) to instantly pay. Of course, once in PayPal, they'll send it as a gift to a different address, if they don't simply change your mailing address and password and transfer your bank's assets to themselves first. Or, maybe you have your credit cards on file to make paying easier, by not having to enter all that information over and over. They don't have to access your financial records as a hacker when they can access them as the owner.
If you're already set up safely, then good... they'll just go to the next name/password on the list. There's only a million of them. Somebody will benefit their cause.