Source: Poopy Pond.
Amazon has a page dedicated to reusing their boxes to creating something new - condos, robot suits, or forts. While I think it's possible to simply use them as storage boxes or folding them up into flat boards for reuse later, I think this is a great idea.
We are still sheltered at home due to the pandemic right now. Perhaps, this is a fun and creative family activity especially if you've got little ones in the house who are restless.