>
> As long as some message refers to that ID, notmuch will create a "ghost
> message", used for threading.

You can look for a specific ghost message with something like

$ quest -btype:T -b id:Q -d .local/share/notmuch/default/xapian \
     "type:ghost and id:jwvczk7opm8.fsf-monnier+emacs@gnu.org"

quest is also part of xapian-tools. Unfortunately I don't think quest
understands the way notmuch uses multiletter prefixes (without a :), so
to find references you still need to use xapian-delve.
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