By "no provenance", you mean some scenario like no one stood guard at "Rusty" Livingstone's house for 30 years to prevent the photos being planted, or "Rusty" (who was the DPD's photo-developer) fabricated the trigger-guard photos before he sealed the briefcase.
The provenance is about as good as it gets within normal reason. The briefcase was in "Rusty's" possession for all that time. He didn't even know the potential of what was in the case; his nephew Gary Savage brought the material forward. Too bad for your hero-patsy Oswald that whenever evidence that's better-quality shows up or when forensic techniques (ballistic testing; 3D trajectory analysis) improve with science done by professionals, it always reinforces the LN scenario.
What a load of BS. There was no new “technique” here. It was the same kind of fingerprint analysis the FBI did in 1964.
And who said the briefcase was sealed for 30 years, and how would you know? How would you or anybody else know where those photos came from?
Oh yeah — cop said so.