Ok, so I should have done my homework. The price was $399 w/free shipping; too good to be true. Everything looks like the original packaging and the detector has the protective tape front and rear; no finger smudges or scratches; screw heads look untouched; nothing to indicate used or refurbished; all accessories in there sealed bags; everything in the case as if never touched. Just that there's no label with the serial# (and the firmware? The guys add says "Latest firmware"). I powered it up in the garage and ran through the programming and everything APPEARS fine.
Is there any way to pull up the s/n and firmware on the display? Am I screwed if it should need warranty work? Any way to verify that it's working properly or am I ok since it powers up and I get no message?