The additional - dash and 2 digits at the end of the violations is known as a "Ticket PIN".
I may look like it's part of the ticket number, but it's not. It's only used as a password for the ticket when appealing it.
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The PIN is only used when appealing tickets if the user isn't logged in (this functionality is used on the new PHP user side, Brown is currently using the old ARO user code, so you don't see the new appeal area).As . As an example you can see the "Appealing a Ticket" box on the log in screen here.
The pin is used in that box to give some protection from public users just looking up sequential ticket numbers.
Once you click check you will be presented with a screen that allows you to appeal or pay the ticket.
Notice when the record of the ticket is found it does not include the PIN.
Additionally on the Admin side