Letterlocking is a method of securing written communication without the requirement of an envelope or packet using a combination of intricate folding techniques. https://www.messynessychic.com/2022/12/14/signed-sealed-but-not-always-delivered-the-lost-art-of-letterlocking/
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@estherschindler
Not for me. I'd just get it all folded up super secure when I remembered a P.S. I wanted to add.