One of the things that I wonder all the time is the PMS of new cars.
Especially with plugs.
Sa US, normal plugs aren't replaced until it reaches 10K miles or so, mga iridium tipped 100K miles before they replace it sa casa.
Dito unang PMS mo palang papalitan na... Makes ABSOLUTELY no sense since a new car will have great burn sa engine, there's no reason why this needs to be done.
There's no way for you to know either if it was replaced or not, unless you marked it beforehand.