Trust me, I can relate. But the one thing you do know is that the bag is somewhere. Either someone has it, or as we say here in the states when we lose something, it's sitting where you left it laughing at you.
I hope you find it.
I once lost my wallet at work and looked everywhere for it. It had $500 in it and all of my ID and such. We were working at a remote site, and after 8 hours of work it was time to make the long drive back to the office. I made a quiet prayer to God as I really needed my wallet back...
As we were pulling into the driveway, I couldn't believe my eyes...
There, lying perfectly between the two painted road stripes lay my wallet. Hundreds of cars must have driven past it, but because it was black on a dark road and lined up in the PERFECT position, nobody saw it for 8 HOURS.
I darted out to get it thanking the good Lord Jesus along the way. The next day I bought a truckers wallet with the chain attached and have never lost it since. Good luck!
Oh wow, that is so lucky. I've kind of accepted that my wallet and bag is gone, but I do hope I get my stone back and the keys would be great also.