I think that was just taken off the caseback image, which says "One of 1350". I don't know if that applies to a specific given model, or the total number of models, with different lower LE amounts for each color combo variation. It may not include the numbers for the ones included in the box set.
Interestingly, MS Copilot provided this info on the Collectors' Box set of 10.
View attachment 1777586
Click to expand...