This is pure theft by western imperialists who stole what they could from the countries they invaded or colonised. I wonder what the invading forced have stolen from Iraq since 2003, Iraq of course was part of Persian Empire so we are talking Persian (Iranian) history and heritage.
actually the staff they stole from Iraq are lot older than persian empire time...they stole lot of historical staff from summerian and early assyrian periode and nobody knows who has the staff...summerian for example are the older known civilization with the oldest known city of "Ur" ...for us IRANIANS of course is also important to know that the mesopotanian cultures had a huge influence on IRAN..lot of architectural elements in Perspolis show huge
similarity to older Babylonian buildings.... actually the major power of IRANIAN empire based on uniting all cultures and n ations which were ivolved in the huge persian empire,but as persians we have to admit, that Persians learned a lot from great mesopotanian ancient cultures
by the US invasion lot of iraqi museums were suddenly empty.....they believe that some western collectors and museums already were involved in stealing by offering high prices for some unique object....