Jerry, a very sad story indeed... but a nice artillery top...
From the photos you were kind enough to post links to, I can make the observation that this Luger had been refinished at some point. It is a very well done refinish, but you can tell because the blueing is over some of the pitting that would have been too hard to remove... the DWM logo on the toggle is very thin (meaning not deep) indicating that the top of the toggle had been refinished. The bluing wear along the sides of the front sight band is also inconsistent with a pistol that should have had some obvious holster wear...
Please don't take this as really bad news because the overall assembly is in nice shape and you can certainly find a frame and associated parts to make this a terrific shooter example of an artillery... the likelihood of the ex-spouse relinquishing the bottom half is virtually zero... so building this back into a serviceable firearms is certainly the way to go. Even if someday hell freezes over and the bottom half is returned, you could always sell the parts you buy to make it complete and will probably not lose any money...
Put your needs in the Wanted To Buy forum and somebody out there in our membership will probably have what you are looking for. Since the bottom frame is the controlled serial numbered item, buying one will have to be treated as if it is a complete firearm and will have to go through a FFL dealer or if you are a C&R license holder, you can buy it directly...
Best of luck, and if no one has welcomed you to the Lugerforum, let me...