[Robert DeLong]

No, it was the rare earth elements, including cerium, strontium sulfide and pure titanium, found on the J.c. Penny clip on tie. He may have indeed been a tacky dresser though, but that is not the new clue. 8>)

Considering that back then these elements were not in widespread usage, it is a good new clue to follow.

Curiosity makes me want to know who this person is that apparently successfully pulled off the heist.

[Freedom4US]

There’s no evidence he was successful that I’m aware of though I have not followed it closely.

His reserve chute was sewn shut, it was a demo model. An experienced chutist would have checked that. For that matter, maybe they gave him a sabotaged main chute? He jumped at night, in a rainstorm.

None of the cash has ever been spent. Somebody found about 5k along a river in 1980, that was part of the money given to him. Theory is he landed in water and drowned. Dredging operations blew some of the money onto the bank where it was later found.

What’s weird is nobody noticed this guy disappearing in his immediate family.

[TheNext]

They found Kryptonite on DB Cooper’s tie.

CASE CLOSED