In my experience and I’m paying storage fees ($190AUD/month) to save my boxes… because the foam inserts and boxes cannot be easily replaced esp for gear that is over five years old. Manufacturers are not always a reliable source. Values can drop 20% because of this at resale.
And if you are shipping, then nothing replaces original packaging. FedEx total destroyed my ARC D240 amp when asked to pack and ship. They didn’t pack it, they sent it as is then denied the insurance claim on it too.
You can use room space or attic space to store provided you control pests…
But keep your boxes and inserts. If you want to sell and ship safely. I’ve shipped so much gear all over the world UK EU USA AUS Middle East Singapore and original packaging is the only choice that’s secure for components.