Other instruments that could be used.
It is also possible to instigate a civil or penal procedure for the offence of theft or misappropriation and a request for mutual legal assistance. Other solutions are through the appropriate diplomatic channels or through the good offices of UNESCO, as well as alternative dispute resolution and mediation, arbitration, exchange, gift and bilateral negotiation.
There are several codes of ethics, e.g. the UNESCO International Code of Ethics for Dealers in Cultural Property (1999) and the Code of Ethics of the International Council of Museums (ICOM), adopted in 1986 and revised in 2004. The latest version of the Code was translated into Dutch in 2006. The Code has a definition on due diligence. Registered museums in the Netherlands are bound by the Code in their professional conduct.