Hi Tammy, as with all starters (dried or otherwise) the proof will come when it's time to revive and put them to use in your baking. You may want to save all your attempts in separate jars in case one works better than the others, but I suspect all will be usable. I always recommend keeping some liquid starter in the back of your refrigerator as well, just in case you have difficulty activating your dry starters. A mature starter will last quite a long time in the refrigerator, so it's a perfectly reasonable back-up plan to keep some starter in there as well. Just expect a few days of twice a day feedings at room temperature if your starter has been stored in the fridge for months. 

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