Maybe the following applies?
You were too lazy to get your DS.
Basically you dismissed the DS from your mind.
Humans affect their environment.
We categorize everything in our surroundings.
Yesterday the tree stood there, so I expect it to stand there today, unless someone cut it down.
At the very least I expect to find a stump, or gaping hole.
In this chaotic mass-hallucination we call the universe, items we have organized in our memory have a
tendency to stay around, and items we
dismiss have a
tendency to disappear. (?)
So If you just place stuff somewhere, but don't register where, then they 'fall' through the fabric of space into the endless void of nonexistence,
only to be found sooner or later by you (if you re-registered them), or some other person in the past/future, etc...
Aah! So that is where my sparkplug ended up!
Maybe a new approach to organization helps?
I have no trouble finding stuff. It takes time, but if I
know I have it, then I will find it.
I organize my stuff loosely, and keep it all in a big room.
So my stuff is somewhere in this diffuse cloud of 'possibly in that room' but at the same time i
definitely know that it is.
Somewhere
in there.
But the moment something slips my mind, I fail to find it.
Though a Heisenberg-Uncertainty approach sounds wonderful, in my experience stuff just ends up hiding behind other stuff, or to have fallen into a
precarious place that was not obvious the first (and 15th) time.
So physical reality still reigns.
Then again, maybe that's just me remembering, forcing the void to give my stuff back!