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

{
  "limit": 1000,
  "next_marker": "JV9IRGZmieiBasejOG9yDCRNgd2ymoZIbjsxbJMjIs3kioVii",
  "prev_marker": "JV9IRGZmieiBasejOG9yDCRNgd2ymoZIbjsxbJMjIs3kioVih",
  "entries": [
    {
      "id": "11446498",
      "type": "file_version_retention",
      "file_version": {
        "id": "12345",
        "type": "file_version",
        "sha1": "134b65991ed521fcfe4724b7d814ab8ded5185dc"
      },
      "file": {
        "id": "12345",
        "type": "file",
        "etag": "1",
        "sequence_id": "3",
        "name": "Contract.pdf",
        "sha1": "85136C79CBF9FE36BB9D05D0639C70C265C18D37",
        "file_version": {
          "id": "12345",
          "type": "file_version",
          "sha1": "134b65991ed521fcfe4724b7d814ab8ded5185dc"
        }
      },
      "applied_at": "2012-12-12T10:53:43-08:00",
      "disposition_at": "2012-12-12T10:53:43-08:00",
      "winning_retention_policy": {
        "id": "12345",
        "type": "retention_policy",
        "policy_name": "Some Policy Name",
        "retention_length": "365",
        "disposition_action": "permanently_delete"
      }
    }
  ]
}