Stupid headline. Literally everyone who reads it is going to think the gold bars in Menendez' possession were stolen property, but they're not and that's not the point of the story at all.
TL;DR: In 2013 thieves stole 22 gold bars from the guy that bribed Menendez. Because he's rich, the cops actually solved the crime and returned the property and, here's the actual important bit: Fred Daibes, the guy that bribed Menendez, signed a release form specifying that the stamped, numbered gold bars were his. Now Menendez has some of them and that provenance makes it a lot easier to show where he got them.
He is so transparently desperate to put Haley in the rear-view mirror.
And he's already told us what he's going to do to get out of debating with Biden: He's going to insist that none of the traditional debates be held and instead they all must be Trump campaign events hosted by his sycophants rather than independently run debates. When he doesn't get his way he's going claim Biden didn't want to debate him.