Had a customer who wanted to do a mailbox restore from 2 years ago but wasn’t sure which mailbox database the mailbox would have resided in back then. I found a really useful command to show the move history on the a mailbox:

 

(Get-MailboxStatistics <USER> -IncludeMoveHistory).MoveHistory | select CompletionTimestamp,SourceDatabase,TargetDatabase

 

Which gives you something like the below:

 

Hope it helps!

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