The New York Times has carried an AP Story about a former GI returning books he found at the end of WW II to the German Embassy. See http://www.nytimes.com/aponline/2009/10/06/us/politics/AP-US-Law-Books-Germany.html
At the time, he thought he was "liberating" some souvenirs. Today, however, such activities are frowned upon, at least officially.
In any event, it is nice that Germany finally has received back the books, though I suspect they are of limited monetary value.
Will the gesture encourage others to return similar "liberated items?" Perhaps. As WW II Veterans leave us, their children may be less attached to such items, and hence may be more inclined to follow suit, at least in cases where they know their significance.