So I drove down to Santa Fe anyway.

The two non-missing boxes were there at the Yellow dock. One box was enormous and contained the two side panels for the cabinet. The other box was smaller but much heavier. It appeared to have the bulk of the remaining MDF pieces in it.

Unfortunately, the side-panels box had a bigass tear in it, through which I could see the heavily scratched outer surface of a side panel. The other box had a smaller hole in it, and the piece inside wasn't damaged enough that I'd care. But I couldn't accept the shipment with such visible damage on the side panel, so I had to refuse the whole thing.

Now they'll ship it back to the vendor, who will file a claim with Yellow to get their money back, and will probably only then start making me a replacement. And these things turn around in a month, btw.

So frustrating!