Does anyone know anything about FHP # 561?

[Cobra Jet]

So, if the unit # 561 is indeed "real", would anyone know about where this vehicle was or might of been stationed in FL while in service?

I've searched all available online FHP SSP pics on both SSP sites, and by random googling as well - and the closest I have come to that unit # is in the #57x range. Based on the 57x's I come across, some had State plates which said "Troop D".

Did certain Troops have consecutive unit # SSP's within their group, or do the unit # not tie back to any specific Troop?