Last night I loaded 34 video clips into a project bin labeled DAY ONE VIDEO.
Today, per the screen shot below, I can see that I still have 34 items in the bin (as seen in the upper right hand corner of the screen shot), but although the folder is open, I can't see any clips.
I had moved them all into their respective "wide" "medium" and "tight" subfolders.
Obviously I've been burning the midnite oil.
Glad that you found their new location, and even before someone here could suggest having that morning cup of coffee and looking again...
PS - I feel your pain, as similar has happened to me - that's why my forehead is so sloped - from slapping it, when I remember what I did.