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Finally an answer: the current Oval Office Moon rock is from Apollo 17, collected from Station 6 along the North Massif in Taurus-Littrow on December 13, 1972. https://twitter.com/NASA_Johnson/status/1352422598328643585
The Oval Office sample was taken from block 5 at Station 6, which is peeking in from the left edge in this black and white 70mm film scan (AS17-141-21607)
The source block is also visible here in these two color film scans (AS17-140-21432 and 21433) via @ASU's March to the Moon archive
This is great too: watch Apollo 17 astronauts Gene Cernan and Harrison Schmitt collecting samples at Station 6 with video, images, and a transcript (via @nujoud) https://twitter.com/nujoud/status/1352413315197100032?s=20
And just because we can and have, here's the Station 6 blocks (including the largest "Tracy's Rock") imaged by NASA's Lunar Reconnaissance Orbiter on July 28, 2010 (LROC observation # M134991788R) Read more: http://lroc.sese.asu.edu/posts/759
Sample 76015, the source of the one on the shelf in @JoeBiden's office right now, came from this boulder.
Over the course of six surface missions from 1969-1972, Apollo returned 2,200 separate samples of lunar material totaling 842 lbs / 382 kg.
On Apollo 17 much of the sampling EVA activity was captured on TV camera, mounted to the LRV and remote-controlled from Houston. Here we can see Schmitt after bagging the 76015 sample from block 5 at Station 6 (ht @IanARegan)
