Ahhh, thanks! That makes sense that they are just rolling around in the frunk then - no front license plate requirement in Arizona.
I had them too, and didn't quite know what they were. Or even for which vehicle. Finally sent them to that big plastic Por sha place in the sky last week.
__________________
2001 Boxster
2007 Toyota Highlander
2003 New Beetle Convertible, Turbo, Tip 6 speed