I have struggled with this question for the last fifty years. My observation has been that space available increases over time as one becomes more wealthy. My conclusion has been that keeping high end audiophile component boxes is appropriate.
You can toss the microwave box, the LCD TV box but audiophile gear lasts a very long time and should be kept. I would not rent a space for them, but I would carefully stack them out of the way. If you have chosen high end audio, I am guessing you have not chosen a dead end career… so over time you will be rewarded and space will become available in your life.
I now have a huge storage area where I keep all my audiophile boxes. When I need them they are there. Every 7 - 10 years I trade up and the components are boxed in their original containers and traded in.