According to Mr. Howard, the section chief of the ATF, there is no requirement under the NFA or BATFE to update a modified Trust with the ATF when the people involved are modified. The only time that the ATF must be notified is if one of the Trustees becomes ineligible to be in possession of the items.
A properly drafted NFA trust should notify under which conditions a Trustee should resign, whom they need to notify, and the time constraints required under to avoid having the weapons seized and to avoid risk of jail time and monetary penalties.
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