Can a cookie brand use my contest entered flavor without compensating me?

Question Details: Last year a major cookie brand had a name a new flavor contest. You were able to enter 1 new flavor suggestion per day for a certain period. I submitted 1 new entry per day during the contest. The contest had awards from $50,000 to $500,000 depending on how far your entry made it in the competition. Recently, I noticed one of their 3 final flavors was Pina Colada and I even found them on the shelves at a national retailer. About 9 months ago, I submitted this exact flavor entry and obviously they used it but did not contact me or compensate me. I believe the minimum award was $50,000. I am highly disappointed and have even asked them via email but no reply to date. Do I have a case and can I sue them or how can I receive my due compensation for submitting the entry they used? BTW, not that it matters, but I am a US Army Veteran and was actually homeless at the time and had to use a store's free wi-fi daily in hopes of winning some money and remedying my homeless situation. I would appreciate any help/advice you could give.

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