The La Chapelle-lès-Luxeuil (Haute-Saône) hoard of 15,518 Constantinian nummi was published in Volume XVIII of the Trésors monétaires series. It is the only hoard in the volume and is a useful addition to the library of London mint enthusiasts. The terminal date of the hoard is 342AD but unusually for a hoard of that date a significant portion of the hoard (15%) was minted prior to 325AD. It contains 245 coins from the London Mint, of which eight are unlisted in RIC. Interestingly for me, one of the RIC listed and illustrated coins is an example of the rare S over star/P issue (RIC 120) that is an obverse and reverse match to a coin that was once in my own collection but has since moved on.
The Trésors monétaires series published by the Bibliothèque nationale de France is a rich seam of information as many hoards of this period found in France contain a good proportion of London mint coins. The latest volume (XXIII) contains a significant early hoard of the first Tetrarchy that includes a rare LON issue and many unmarked examples. The Larré trésor contains a total of 44 coins from London and a further 15 of the unmarked continental mint. The terminal date is 300AD and the total number of coins found in the hoard was 929.