List<X> same = Lists.newArrayList(oss.load(keys).<X> now());
assertNull(same.get(0).blah);
assertNull(same.get(1).blah);
assertNull(same.get(2).blah);
List<X> list = Lists.newArrayList(oss.refresh(same).now());
assertEquals(x1, list.get(0));
assertEquals(x2, list.get(1));
assertEquals(x3, list.get(2));