Additional tips:
-Ask for the serial no.daan sa unit. If hesitant muhatag, hehehe... ikaw na lay sabot...
-No meet-ups if possible. Hangyoa ang seller ikaw mu adto sa iya place or office (para katoltol ka later on inig uban nimu sa pulis if naa blema! hehehe...)
-Test camera at all shutter speeds, aperture & white balance.
-Test pop-up flash for consistent output kay basin worn out na nya kaayo ang flash tube.
-If CF media ang gamit sa cam, check for bended pins. Try using other CF's
-Check flash hotshoe contacts for corrosion. Test with external flash. One contact lang naay blema ana, you might lose features sa imu external flash later on.
-Bring laptop & card reader para download dayon then check files.
-Check contacts sa body ug lens. Try removing lens then put back again or try other lenses pud sa body.
-Check battery terminals o contacts for corrosion (body & battery). Try using other fully charged battery of the same kind.
-Lastly,ask for an acknowledgement reciept putting all info about the unit,seller,buyer,payment,terms & warranty if any.
-Then picture2x dayon with seller! hehehe...
Hope this helps! Happy dslr hunting!