The other day I was dragging unnecessary items on my 2015 MacBook Air desktop to the trash and accidentally picked up a folder that I did not want to trash. That's happened to me many times before. "No problem," I thought, "I'll just remove it from the trash," but when I opened trash to drag the folder back the desktop, the folder and all the individual files that I had just dragged in were not there. All the files I had dragged in on the day before are there, as are things I've dragged in since; just these few items are gone. I can't locate the folder that I want back anywhere--Finder can't find it--and I have no idea what happened. Any thoughts about what might have happened would help and any ideas about the possibility of finding it again appreciated.