Unless you've kept old links, we're losing site of valuable stuff very quickly.
There's probably a lot of valuable stuff left inside.
I suppose you've got a lot of valuable stuff there.
The really valuable stuff was always a risk to the source itself.
When it comes to valuable stuff, we bring our own.
Just use your common sense - don't leave truly valuable stuff unattended.
I know you carry a lot of valuable stuff in your briefcase.
"He has a great deal of valuable stuff here."
"That's valuable stuff that shows the way his mind was working."
It wasn't the first time he'd discovered valuable stuff in the trash.