curl -i -X GET "https://api.box.com/2.0/storage_policy_assignments/932483" \
     -H "authorization: Bearer <ACCESS_TOKEN>"

{
  "id": "ZW50ZXJwcmlzZV8xMjM0NTY3ODkw",
  "type": "storage_policy_assignment",
  "storage_policy": {
    "id": "11446498",
    "type": "storage_policy"
  },
  "assigned_to": {
    "id": "11446498",
    "type": "file"
  }
}