While he was certainly active in this field at the beginning of his period of office, it is not clear whether Celik continued this policy throughout it. In recent months, not very much has been heard of this campaign and the outstanding cases that were in dispute. About the last major press item which I can recall seeing seems to be the Spiegel article ' Museum Wars: Ankara Demands Artifacts from Berlin' (March 14, 2013) proclaiming "a dispute is heating up between Turkey and Western countries, with ancient artefacts at stake". In fact the article mainly concerns local matters of German-Turkish collaboration, some of the accusations seem rather frivolous.
It is interesting to reflect on the reasons why the media seem to have quietened down over this issue in the past two years. Has the campaign been wound down? Is the building of the museum going ahead? (I can find nothing recent which mentions it.) Has this issue been overshadowed by the discussion of the smuggling of artefacts out of Syria through Turkey?