curl -i -X GET "https://api.box.com/2.0/storage_policy_assignments?resolved_for_type=user&resolved_for_id=984322" \
     -H "authorization: Bearer <ACCESS_TOKEN>"

{
  "limit": 1000,
  "next_marker": "JV9IRGZmieiBasejOG9yDCRNgd2ymoZIbjsxbJMjIs3kioVii",
  "prev_marker": "JV9IRGZmieiBasejOG9yDCRNgd2ymoZIbjsxbJMjIs3kioVih",
  "entries": [
    {
      "id": "ZW50ZXJwcmlzZV8xMjM0NTY3ODkw",
      "type": "storage_policy_assignment",
      "storage_policy": {
        "id": "11446498",
        "type": "storage_policy"
      },
      "assigned_to": {
        "id": "11446498",
        "type": "file"
      }
    }
  ]
}