Come on, don't need to get offended, I know that it is fashionable these days, but please, don't.
But to answer your question: those codes are industrial numbers for internal use, that is why they are usually hidden in the hardest-to-find corners. There is nothing romantic about those numbers. And looking for anything from April just limits your choices in a weird way, while it is not even vintage being 3-4 months old. And the code is just a rough approximation to the special day, because of the week-format. If you get something brand new from Vuitton, you will get a piece that was made the year you married the love of your life. It doesn't sound worse than 'it might had been made somewhere around that day in April'.
And there are so many nicer ways to add that special sentimental value. You can always ask Vuitton to hot-stamp the date on them, yes they can do numbers. Or stamp your and your partner's initials. Or have a Mon Monogram piece and use your and your partner's favourite colours for the stripes and either the exact date or your initials. That would be very very personal.
Or if you insist on a used piece, there are talented artisans who can do the painting, or Vuitton would also hot stamp for you of course. I just simply recommend you to choose something you actually like for what it is, and not for the week it was made. And then you can make it more personal and romantic than by having a certain industrial number buried somewhere inside.