Simple, but maybe stupid side marker question

[Coffinhunter]

I am picking up my 2003 Boxster S and I love the fact that the side markers are clear vs. the amber that I see on so many others. However, I don't know why they are clear. Other 2003's that I see have the amber, and I know for a fact that my father in law (who I am getting the car from) did not change them out himself.

So what's the deal?

Thanks