If there are white borders and no visible effects, then do you care? It might have lost a little of the Dmin and newer papers certainly have a brighter Dmin, but the real question is whether it meets your requirements - even if the paper is fresh it may not, or vice-versa.

You could do an A/B comparison of a print against some fresh paper and see if you're happy that the quality is close enough. Note though that different papers have (deliberately) different contrasts; Portra Endura will be lower contrast than Supra Endura or Crystal Archive.