@ Support - You are correct we would like all trustees removed (Send As, Send on Behalf and Full Access) after the two weeks is complete.
Below is the current process in screenshot and code pasted in.
$mbGUIDProperty = "adm-CustomAttributeBinary5" # TODO: modify me
$mbStorePathProperty = "adm-CustomAttributeText5" # TODO: modify me
# Get mailbox GUID and mailbox store DN
$exchangeGuid = $Context.TargetObject.Get("msExchMailboxGuid")
$mailboxStoreDN = $Context.TargetObject.Get("homeMDB")
# Save the GUID and the DN to Custom Attributes
$Context.TargetObject.Put($mbGUIDProperty, $exchangeGuid)
$Context.TargetObject.Put($mbStorePathProperty, $mailboxStoreDN)
$Context.TargetObject.SetInfo()
# Disconnect the mailbox
$Context.TargetObject.DeleteMailbox()