That was not as bad as I had expected it to be.
I have not run every single hard drive yet, but I can now find all the power for the next time I want one to work.
At first I was terrified, because I had forgotten that some of them use 5V and some use 12V adapters. I feared that a couple of them had failed.
But, no. Just need the right stuff plugged in to work right.
Now I have all of the drives in gallon zipper top bags with the appropriate adapter and the proper USB connector ... all fourteen of them. Still have a large box of seemingly random cables and adapters, though.
Actually, many might think that box is all just a bunch of junk, but a few days ago when my son upgraded his computer to a SSD (no mounting hardware was included in the package), all I had to do was dig through this box of "goodies" to find an adapter that would fit his full size HDD slot and some tinier than normal screws to hold it all stout and we were ON IT!! I rarely throw things away. This causes suffering, but I still keep stuff.