A lot of gun metal the french used from melting down Gribeauval guns, captured guns, and forcefully removing bronze and tin and cannon boring machines from vienna on two occaisions. One lot of machines went to Bavaria.
In addition, your comment questioning the issue of AnXI guns to various army corps from the guns cast in 1812 I provided the listsings for. Yes they did get sent to the army as their is a paper trail saying as much. A vew few gribeauval guns were used in 1813 to 1815 campaigns. A lot of garrisons guns were captured Austrian or Prussian ones move around. some older gribeauval siege guns were used in spain, for the same reason that spanish ammunition could be used. I have provided a reference for this. Artillery general Pernety also makes similar comments as wella s to why gribeauval guns were used in spain.