Hi @midland192
I love a challenge and this is one of them 🙂
First thing I have discovered is that if you use get emails to retrieve attachments, if an msg file is attached, it doesn't list it in either get emails v3 or get email v2.
For example I created the following email:

I had both my test bin file and an email msg file containing the bin file. When I run the get emails or get email, it only returns 1 attachments. If I do the same with just an msg file attached, I get 0 attachments.
I'm not defeated on this one yet but wondering do you experience the same?
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Cheers,
Damien
P.S. take a look at my new blog here