Thank you for the comments. I will check again the dates/names tonight for the Third Corps.
The footnotes of Foucart often speak of his own frustrations with the French Archival records, and he tries to speak to some of the obvious mistakes. Evidently the different Corps did not report as often nor as accurately as one another.
Do any of the readers know who actually prepared these muster reports and where? Could they have been done at the Depots? This would explain their lack of percision.