vernment contract, the invalidation of a contract after it has been fully performed is not favored." Seh Ahn Lee, 895 F.3d at 1372 (quoting in part American TeL & TeL Co. v. US, 177 F.3d 1368, 1375 (Fed.Cir. 1999)). In analogous situations involving contracts between the government and a vendor, courts have refused t