May have been ripped off with my snows?!

[stonatox5]

I was hoping to set my mind at ease. Three days ago I went and installed new Pirelli Scorpion Ice and Snows for my '06 4.4. I'm usually not too picky about where I buy tires and shop purely on price. These guys were the least expensive. I thought everything was OK until I brought my x5 to the dealer today for some routine maintenance and took a look at the Scorpions in the Parts dept. The tread was deeper than mine and more squared off at the edges where it meets the sidewall. Mine definitely aren't as deep and more curved at the edge (again where the bottom meets the sidewall).

The Parts guy said there are different Scorpions in that size (one for Benz, one for Cayenne...etc). This may be true however after visiting the Pirelli website all those models including BMW have the same depth of 14/32.
Perhaps I already have my answer but I'm hoping this guy didn't sell me used tires!! Any advice would be appreciated.