The Tiffany Elsa Peretti Bean Thread

I found a second hand bean 12mm silver necklace online with tiffany packaging and everything but the seller posted that there is no engraving on the back of the bean. - do you think this is a fake one?
Many of the newer style beans do not have engraving on the back. I purchased a rose gold bean directly from Tiffany store in 2021 with no engraving on the back, only on chain tags near clasp.