What we suspected, turned out to be true… Ebay confirmed that the data is not legitimate. This is now also confirmed if you look at the data. We looked at

• is this email address associated with an ebay account? (worringly, one can easily check this at the ebay site)
• is this email address known in https://shouldichangemypassword.com/ ?

Out of 12,663 records,

• only 2,025 emails are registered with eBay and
• 3,720 emails are known hacked emails according to Should I change my password.