Personally I would go ahead and pitch the second pack if you can get one. But I would definitely add more bugs from other bottles to get a more complex final product (and more sour).
I mixed a pack of 3278 with a pack of 3763 in 5 gallons of primary and was very pleased with the results a year later.
Primary: Saison w/Dupont strain
Secondary: Belgian Pale, Saison d'Lupulin, Farmhouse IPA
Kegged: Saison d'Lupulin
Sour Secondary: Cabernet Oud Bruin, Sour Cherry Oud Bruin, Sour Ale base, Kriek, Wild Night, Wild Night w/Blueberries, Wild Noel
Sour Cellared: Cabernet Lambic, Wild American, Merlot Lambic, Namaste Golden Ale, Saison Twenty-Three, Spring Equinox Saison, Belgian Pale, Orval Clone, Chardonnay Saison, Sour Cherry Saison, Cabernet Flemish Red, Bordeaux Lambic