In that section, I usually use the "search this forum" feature and just type in the town or city where I spotted someone and then it shows me a list of topics containing that word.
Remember, it may be easier to narrow it down by location, but I'm sure there are several Panda's, Cinq's, Puntos, GPs, Bravos and Multipla's in every town, so it's still not really narrowing it down!
Just scroll down the forum view within "Spotted/Was it You?" and press CTRL+F and enter in any familiar keywords like "Broom yellow Punto" or "Green Stilo" or something to the likes. That often works.