The levels of large inland lakes are going down. Lake Superior, Lake Victoria, Lake Michigan, and Lake Huron are all down considerably. Those are the 4 largest lakes in the world. That counteracts some of the reservoir water retention. How many others have been reduced world wide? There were also stories about water reservoirs being close to running dry in the USA until this winter that was full of record breaking snowfalls.
On the other hand, the huge Caspian sea is below sea level. Its water level has been risen 2 m over the past 15 years and it is still rising. That could also be seen to lower the oceans' water levels. All of this speculation is fun but ultimately pointless. The slight cooling of the oceans would still be enough to account for any lack of water level rise.
