The soap (used and unused), toothpaste, the white plastic cup, and the razor blades were found at North Beckley. What would be the reason for checking those items for fingerprints?
Already answered, Mr Nickerson, do try to keep up:
Those would have been tested to see if they bore fingerprints of any party other than Mr Oswald. Such would indicate known associates, potentially of interest to the case.
Standard procedure, no?
What else you got?