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BritTim beat me to it...
I got the same search results also using Header:Message-ID:string instead of msgid:string.
It seems that saving the URL produced by this search and reentering it in a separate browser tab works and brings up the single message, so it may be a convenient way to save pointers to important past messages.
FastMail also allows saving searches and then they appear at the bottom of the folders list. I would have used this if saved searches could be collected inside folders. But as it is that they must all be listed in the top level of the folder tree they are of limited use.
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