The box has been in the corner of the spare room since you moved in. You did not unpack it. You have not opened it. You know what is in it - some cables, a couple of books you have read, an object of unknown purpose that you moved from the previous flat because throwing it away seemed hasty. You are not throwing any of it away.
This is not unusual, and it is not simply disorganisation. Keeping things we do not need is an extremely common human behaviour with some genuinely interesting roots. Understanding those roots does not necessarily help you throw the box away, but it at least makes the behaviour feel less like a personal failing.
The most immediate explanation is loss aversion - the well-documented tendency to feel losses more strongly than equivalent gains. Throwing something away is a small certain loss. Keeping it is the possibility, however faint, that it will one day be useful. The asymmetry is felt even when the rational case for throwing it away is clear. You know the cable is for a device you no longer own. You feel, despite this knowledge, that throwing it away is premature.
Objects also accumulate meaning in ways that make disposal feel like something more than disposal. The object in the box may have been a gift, or was bought during a particular period of your life, or is associated with someone who is no longer around. Throwing it away is not just discarding a cable - it is deciding that the connection it represents is no longer worth preserving. That is a heavier decision than its material value suggests.
There is also what might be called sunk cost of ownership. You have moved this box twice. You have allocated space to it in two flats. Having done all of that, throwing it away now requires acknowledging that the moving and the space were unnecessary. That is a small admission of irrationality, and irrationality, even retrospective irrationality, is uncomfortable to acknowledge.
The box will probably be moved again. This is not a prediction about weakness of character. It is a prediction based on how loss aversion and the meaning of objects interact with the low urgency and high discomfort of disposal decisions. The spare room is full of perfectly good reasons not to open it today.
Disagree? Say so.
Genuine pushback is welcome. Personal abuse is not.