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? 
if they do not bother you, then let them stay in the portfolio. and if they do, or the project turned out to be a scam - throw it out and forget about them. I also have a couple of these, I think that everyone has