Surplus can be fun, but here are some advice notes:

-Virtually no machines are complete.  Hard discs especially tend to be 
pulled.  Only "full" box I ever got was a HP 712/60, and probably because nobody 
could figure out how to strip it.

For cases also inspect for missing drive carriers and such.  I'd rather buy a 
$5 case at Surplus than a new $30 one, but often drive carriers and rails 
disappear

-Cables you'd want to test with are rarely handy.  If you have a VGA->Sun 
adapter cable, it might be worth bringing along to test the dozens of Sun 
monitors always present

-Don't bother for desks.  I wanted a metal desk (wood desk strains under 
weight of monitor), and price was USD 150+

-Bear in mind a slope outside front door, for when you're shoving a cart with 
83kg of 
equipment on it

-Recognize size limits of your vehicle.  I did a nasty number on the interior 
of my car when I retrieved an IBM 3174-1L terminal controller