| They're definitely custom in-house fonts. Until some fan makes a clone of them, you're not going to find them.
If you're tech-savvy and have the legit pdf copy of the PHB, there might be a way to extract the font from the PDF file--the samples in the book have all 26 letters and 0-9, so you'd at least have enough to write basic words and phrases.
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Travis Stout
"An absolute monarchy is one in which the sovereign does as he pleases so long as he pleases the assassins."
--Ambrose Bierce |