Nightmare mate.
I did something like this once.
Cleaned out the garage when I was moving.
All the stuff I wanted to keep was in bin bags on the left ,and stuff I was chucking was in bin bags on the right.
Yep you guessed it, I threw the wrong bags away. 3 bin bags full of good gear.
All my fishing photo albums, my sega game gear and games (this was years ago lol), and loads of other goodies.
Was the photos I was most gutted about.
Proper gutting.
Hope you get something sorted mate