Help using /objects/properties with POST (vs. GET) to get props from many objects

I am looking for help using POST with the /objects/properties endpoint.  My goal is to get properties from a specific list of objects, all the same type.  I am using a GET with a view to get the object ID & version info, and then want to assemble a POST with /objects/properties avoid the url length limit, as advised in a few posts in this forum.

Using GET with the objectTypeID/objectID/latest works fine, e.g.: /objects/properties;179/1389/latest;179/1511/latest;179/1512/latest

But I'm not able to make a POST to the same endpoint work, e.g. /objects/properties (with objver input).

The closest I've gotten is with this input, this is the ObjVer info from one of the objects:

[
    {
    "ObjVer": {
        "Version": 3,
        "VersionType": 4,
        "ID": 1389,
        "Type": 179
        }
    }
]
This results in a 404 not found error, but, I know the object is there and that I have access to it. 
 
{
    "ErrorCode": "11",
    "Status": 404,
    "URL": "/objects/properties",
    "Method": "POST",
    "Exception": {
        "Name": "COMException",
        "Message": "Not found. (ID: 0)",
        "InnerException": {
            "Name": "MFilesException",
            "Message": "Not found. (ID: 0)",
            "StackText": "Error reference ID: 7234e0bd-3fc2-42e9-8f9d-12d2a834d89e",
            "ErrorCode": "11"
        }
    },
    "Stack": "Error reference ID: 7234e0bd-3fc2-42e9-8f9d-12d2a834d89e",
    "Message": "Not found. (ID: 0)",
    "IsLoggedToVault": true,
    "IsLoggedToApplication": true,
    "ExceptionName": "COMException"
}
What is the right way to use this endpoint with POST to get props from a few hundred objects?