What could possibly have happened to these photos on my computer?

Okay, I’m normally pretty computer savvy, but this is just weirding me out.

I looking through my folder of really old digital photos and I came across some photos from an old camping trip. I noticed two in particular from the series that I liked and wanted to come back to when I was done.

When I was done, I came back to find those two and they were gone. All the other camping photos appear to be there, but those two are missing. My folder is sorted by date taken, so all the camping photos should be together. I checked my recycle bin to see if I could have somehow accidentally deleted them, but I haven’t put anything at all into the recycle bin today. I KNOW they were there because I was JUST looking through them!

What the heck? Do you have any ideas on what might have happened to my photos? Is there any way for me to see a history of my activity within windows explorer so I can see I somehow moved them to another folder accidentally?