You might also check your system for keyloggers like azorult or hydra ( usually embedded with pirates games in torrents)
Not relevant if he is using a hardware wallet and never entered the menmonic on his PC.
And if he did, it doesn't necessarily have to be a keylogger, but basically any other kind of malware.
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Dont listen to this legendary person, he is TOTALLY WRONG.
Azorult and hydra takes screenshots, so whenever you wrote those words down, they might have been snap shot and sent to hackers.