You should contact the national office. When my chapter was attempting to plan a 50th anniversary event they provided us with the contact information they had on file.
Also contact your campus's alumni office. Often they keep track of their alumni's greek affiliations. I know for my campus I was able to get a list going by going through our alumni directory but if they feel it will be helping them get alumni back in contact with the school they may help you with a mailing or something. It never hurts to ask.
Good luck with everything!
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