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This is because software/programming languages often count starting at zero instead of starting at 1.
If there's one mbox on the page, it would have the ID of 0. If there are three on a page, their IDs would be 0, 1, and 2.
Have a good day!
Thanks for that helpful explanation, Daniel!
You're welcome, Amelia!
Thank you so much Daniel and Amelia for info