An easy way to roughly tell whether you are on the 1st or 2nd set of tyres is to look at the manufacturing date of the tyres. Have a look here https://www.google.com.au/search?q=tyre+date+code&espv=210&es_sm=93&tbm=isch&tbo=u&source=univ&sa=X&ei=mI9DU9rJDYXRkwXn9IDIDg&ved=0CDkQsAQ&biw=1172&bih=939
So if your date code is ??10, then for certain that you are still on the first set of tyres. Good luck and hopefully the dealer can get you a new set of tyres for free!