some subwoofers +1
and...
Large plastic bins for long-term storage of pinball stuff. Sometimes they obfuscate each other, or the subwoofer gets in the way of direct line of sight.
I have a thin binder with clear business card pages to keep everything organized in one place. I write the contents of each bin on the back of an old business card and pop it in the binder. No mindless hiding of a box under a pin allowed!
For example, a year later, when I wonder where did I actually put the box of "new plastics" I just check the binder, and there it is. It's under Grand Lizard behind the subwoofer...
-mof