What to do with old backstage passes? Would they be worth anything?

Anonymous
I have an old backstage pass from Justin Timberlake and Jay Z Legends of the summer stadium tour from 2013. and JT's 20/20 tour from 2014. They have just been sitting in a box with other concert tickets. They were not available to the general public but my aunt knew someone and we got them for free. Should I keep them or try selling them? Would anyone buy them?
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What to do with old backstage passes? Would they be worth anything?
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