I did the claim with my current psn email and the original id I used when I bought my launch ps3. I have no idea how they'll tell either are linked since I sold that ps3 months after launch and didn't buy another PlayStation3 till a couple years later with entirely new information. I have a feeling I'll get a "you're not eligible due to not being found" which is ultimately perfectly fine.
Also, after submitting I never received an email stating that so not even sure what's going on or if that's typical.