The state needs to make it impossible to get a 2nd Wild ID#.
It happened to me once when WILD ID was still new. The difference was someone had coded in the letter 'O' instead of the number '0'(zero). Then when the state couldn't find the match, they issued me a completely new number. Wisely, at the same time, they voided the first. If I had approached them and just attempted to purchase a new, separate, license right from the get-go, I suspect I could have. Then I would still have had the first license, and could have gotten another whole set of tags with that. So watch those 'O's and '0's (zeros). But it's mostly a programming issue.