Can it be unsent...?
I've monogrammed hundreds of notebooks, and I have a little ritual for every one - I check the order, then I load the letters into the machine, then I monogram a piece of card to check everything is setup OK, then I compare the card to the order to double check the letters are correct, and then finally I monogram the notebook.
I do all of that because once you’ve monogrammed a notebook, you can’t un-monogram it.
So maybe double-check that thing before you send it, because once it’s sent, it probably can’t be unsent…