I got an email from someone I filed a NPB on months ago. Now they are suspended and eBay won't reinstate the account unless I agree to drop the NPB.
I'm not saying it's justified, but doesn't that tell you what it is/what you need to do? It seems like they're just trying to get you to verify/update your contact information.
I was also wondering if this may have been a phising scam. Is it possible your account was hijacked? Did the emails have your ebay username in them?