The capture operation returns valuable information, but the SDK discards these data. There is no way to reconstitute this data either.

The C# SDK does the same thing.

Initial Request

POST /subscriptions/112ffcad-4258-4d8c-b660-45124afff157/resourceGroups/packer-Resource-Group-lyrkcktr6z/providers/Microsoft.Compute/virtualMachines/pkrvmlyrkcktr6z/capture?api-version=2015-06-15 HTTP/1.1 --> 202 Accepted

Polling

GET /subscriptions/112ffcad-4258-4d8c-b660-45124afff157/providers/Microsoft.Compute/locations/southcentralus/operations/8c7e9b30-b3bc-4254-a33b-ad43c6a79b50?monitor=true&api-version=2015-06-15 HTTP/1.1 -- responded with 202 Accepted (empty body)

GET /subscriptions/112ffcad-4258-4d8c-b660-45124afff157/providers/Microsoft.Compute/locations/southcentralus/operations/8c7e9b30-b3bc-4254-a33b-ad43c6a79b50?monitor=true&api-version=2015-06-15 HTTP/1.1 -- responded with 200

Content-Length: 1905
{
  "$schema": "http://schema.management.azure.com/schemas/2014-04-01-preview/VM_IP.json",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "vmName": {
      "type": "string"
    },