function getArchivedObjectMD() {
    return getTransitionInProgressObjectMD()
        .setArchive(new ObjectMDArchive(
            { foo: 0, bar: 'stuff' }, // opaque, can be anything...
        ))
        .setDataStoreName(defaultLocation)
        .setAmzStorageClass(defaultLocation)
        .setTransitionInProgress(false)
        .setOriginOp('s3:LifecycleTransition');
}
Computes the object MD of an archived object
@returns {ObjectMD} the MD object