Letter from Frank Elderson, Member of the Executive Board of the European Central Bank (ECB), to Vincent Van Quickenborne, Deputy Prime Minister and Minister for Justice and the North Sea, Belgium, regarding a request for an ECB opinion on a draft law amending the Law of 4 February 2018 on the missions and composition of the Asset Recovery Office and a draft royal decree on the custody of movable assets by the National Bank of Belgium on behalf of the Asset Recovery Office