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If the function is subsequently turned off for users who already have packages in the briefcase, these will remain accessible to them via a direct link to the package until they expire or are deleted by the administrator. However, they will no longer be able to create new packages in the briefcase or see the Briefcase item in the menu.
The elements in Briefcase view are mostly similar to the https://wikisonpo.atlassian.net/wiki/spaces/SPEN/pages/903087256/List+of+user+s+received+packages view, so the description there provides more details.