http://www.openbsd.org/images/rack2009.jpg
I think the big reason Theo doesn't want to ship this offsite is that it's a lot of old/esoteric equipment that often times needs physical TLC in order to make it run properly, or has weird boot requirements, interfaces, etc.
They still have m68k, VAX, and Alpha boxes that are at a minimum 10 years old, that they build the OS directly on all the time.