Don't lose hope OP.
I share now the story of the remote control. This a long and tedious quest that ended happily, but is still a mystery.
Traditionally on Halloween I visit my DPs grave with fellow Goths to toast him. With alcohol, not like a marshmallow. I wear his totem necklace so last year I retrieved it from his precious accessory case, and was surprised to find the big remote control that I'd obviously put in there for safe keeping while packing up my bedroom to move house, which was chaotic in the extreme, and because of that, I'd forgotten it was in there and had to order a replacement. Hadn't looked in the case since June.
I chuckled and thought that's handy, if I lose the new one or it breaks, I know where there's a spare.
About three days later, I wake up having fallen asleep watching TV with new remote and other Internet gizmo thing on the bed, except the little white gizmo was there, but replacement remote was not.
I looked down both sides of the bed, there's no gap underneath, I have a sofa jammed up against the foot so it can't go there. I move the chair by the bed, shake out all bedding, go through a pile of clothes and go through the entire flat. Bleddy thing was nowhere to be found.
Two separate friends came round at different times, and were of course convinced I was just having a senior moment so we repeated the whole process together, to no avail.
Of course, I retrieved original remote from the case if precious things, shrugged and moved on with my life.
About four weeks later, I pick up a pile of dirty laundry from beside my bed - while I have a tendency to slatterny behaviour, I had done several loads of washing that accumulates in the same spot, and it had been hoovered more than once. Nestled in my smalls was the new remote. I will swear on late DPs grave that it had vanished into an onter dimensional portal for those four weeks. I now have three remotes on my bed, and keep a stern eye on them.
Amusingly, as I was typing "inter-dimensional portal" Ross Coulthard said exactly those words in the context of UAPs on YouTube. I am taking this as proof. Of what, I'm not sure. But I have hope for your keys OP !!