I used to keep everything for years in the loft,
nowadays if its a valuable item then I'll probably hang on to the box until it gets in the way, I run out of space.
I did recently purchase a samsung G9 about a month ago, which has an absolutely mahoosive box, which normally I would have thrown away by now, but we are in the process of selling/buying a house so its currently taking up half of my home office until we move, as this monitor would be a swine to move without it.