Section 2504. Wills to be retained after probate; exceptions 1

A  written  will which has been admitted to probate must remain in
  the court, except where the will is on file in a court or public  office
  of  another  state  or  country  under  the  laws  of which it cannot be
  removed.
    2. When it appears that the laws of another jurisdiction  require  the
  production  of  an  original  will  before the provisions thereof become
  effective in such jurisdiction the court may cause any original will  on
  file  in  its office to be sent to any court which, or to any officer of
  such jurisdiction who, under the laws thereof, is empowered  to  receive
  the  will  for probate, or may deliver the will to any person interested
  in the probate thereof in such jurisdiction or to his fiduciary in  such
  manner  and  upon  such terms as it deems proper for the preservation of
  the will and the protection of other parties interested in the estate.
    3. In the case of a joint will which has been admitted to  probate  in
  this  state  the  court  of such county may under such terms as it deems
  proper transmit the original joint will to the surrogate's court of  any
  other  county  in this state for probate as the will of any other signer
  thereof. It shall be the duty of the court of such other county to  keep
  a  true copy thereof in its office and thereafter to return the original
  will to the surrogate's court of the county of original probate.