I'm not sure you need to file anything to keep the carryforward from being effective. But even if you did, you could amend the needed returns to include that. Many people think you can't amend returns after 3 years (when the statute of limitations for refund requests usually expires), but that is only true if you're requesting a refund on the amended return. You can go back forever to correct a carryforward that changes an open year return.
I'd suggest you find another qualified advisor (a CPA, Enrolled Agent, or tax lawyer) for a second opinion.
For more information search for "amending a closed tax year to correct nol carryforward" or something similar.
I am not expressing an opinion on the investment partnership or the correctness of the NOLs you have carried forward but not "claimed" ...
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