As long as the action was started you can still submit the papers unless you had a submit date given by the court in which case you would have to make a motion to restore to the calendar. Speak with a local attorney about your specific facts.
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This advice is not meant to create an attorney-client relationship and is a general anwer to the question posed.
You should be able to use the original index number. Just be certain that the affidavits and documents you file with the court reflect the current updates to the law (some requirements have changed since 2010) - otherwise your case will found defective. In some instance the court/clerk may request an affidavit explaining the delay but this is rare.
Please note that this general response to your inquiry does not establish an attorney-client relationship.You should consult with a competent attorney for advice regarding your particular situation.
Depending upon what was filed and how it may still be possible to use the original index number.
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