I've checked the usual place on Cisco.com, and gave not found any Visio stencils for these 2 boxes.
I found one link on Thwack.com that claimed to have SourceFire 3D System Visio Stencils dated 2013, but they meant 3D appearance, as in not-2D chassis view, and the 3D2000 and 3D7125 stencils don't match the actual unit or Cisco documentation.
Thanks,
seymour