On second thought, though I think this is a total waste of time for a non-slammer integrator, I would say it's a fair deal for somebody with a modicum of electronic device savvyness and computer competence (as a user).
Why? Because these are kits, with multiple units, are all the cameras and DVR likely to be bad? Good chance only one device doesn't work, if it's the DVR sucks, but it's probably the power supply or the hard drive, in that order.
The bigger the kit, the better the odds.
Then there's the possibility that nothing is wrong with anything, and that an incompetent user screwed up the config and returned it, and the only slightly more compentent tester couldn't set it right.