Start-ManagedFolderAssistant -Identity -FullCrawl

Verify MFA Processing:
$MRMLogs = [xml] ((Export-MailboxDiagnosticLogs <user> -ExtendedProperties).mailboxlog) $MRMLogs.Properties.MailboxTable.Property | ? {$_.Name -like "*ELC*"}

Check MRM mailbox diagnostics
Export-MailboxDiagnosticLogs -ComponentName MRM

Examine mailbox folder statistics
Get-MailboxFolderStatistics <User> -FolderScope inbox -IncludeOldestAndNewestItems -IncludeAnalysis | select name, items*, oldes*, top*