I have done some bounty campaigns that were unsuccessful.. Also some were scams. But I have received some tokens from few of that projects. So I need to know this, Is there any opportunity that can I use this tokens? 
Just keep it,and besides even if you sell them still the value is shit,so just let them stay in your wallet and maybe in a years there might be a miracle that they may grow,or some whales might use then to pump snd dump