I was under the impression that with the exotic blueprints that players would be able to "print" any exotic that they've previously had while ever playing Destiny b/c all that information would be tied to player's grimore scores. I have not found this to be the case. I do not have access to purchase previously owned exotics. VERY DISAPPOINTING...
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The system isn't retroactive. You'll be able to purchase any exotic you've previously owned as of the update when they were being tracked. It was mentioned to not dismantle any equipment that you wanted the system to recognize for the update.