Keep in mind that a museum can _acquire_ objects without _accessioning_
them.  This resolves both your concerns about old loan conversion and
accepting gifts that are inappropriate for the collection.  A museum
should have full legal title to everything in its possession, ranging
from office equipment to resource materials to collection pieces.  Some
are purchased, and some are donated with a Deed of Gift.  Only those
items which the museum intends to keep and preserve to support its
educational purpose should be accessioned, through staff or board
approval.  So don't accession something you plan to deaccession -- take
ownership of it, consider it an aquisition, and then terminate your
ownership when you chose.

Miriam Albahari
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Museum Studies student, George Washington University

"Miracles sometimes occur, but one has to work terribly hard for them."
                                                -Chaim Weizmann