From the Rookie criteria (2009 version; 2010 may be different):
Quote:
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2. A returning team may qualify as a Rookie, but in order to do so must not have been in a competition for three years. That is, going into the 2009 season, they cannot have competed in either seasons 2008, 2007 or 2006. Teams whose last competition season was 2005, or earlier, can return this season as a Rookie, OR, they can continue as a veteran with their original number if they wish to do so. Teams that choose to register as a veteran would not be eligible for the above listed Rookie incentives and recognition.
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(emphasis mine)
So if you can get a mentor from that original team, in the same school, to request reactivation of that number, you might get it.