Counterfeit Frontline?????

I recently purchased Frontline Topspot (for dogs) from an Ebay seller but I purchased it before I read the review on "Counterfeit Frontline". When the product arrived, it was made in the United Kingdom and did not have a EPA # (which stands for Enviromental Protection Agency and they ensure the product is safe), so naturally I became concerned. Fortunately, I have a box of Frontline Plus for Cats that was manufactured in France for sell in the US and it does have a EPA #. 

I called the manufacturer of Frontline, Merial Limited, 3239 Sattellite Blvd, Duluth, GA 30096-4640, USA, concerning the product from the United Kingdom, manufactured by Merial Animal Health Limited, PO Box 327, Harlow, Essex, CM19 5TG, United Kingdom. 

Merial Limited stated that they DO have companies all over the world but the only product manufactured to sell in the US is from or France or the US. Products made in France or the US will be the only ones with a EPA #.  Products from United Kingdom is from the same company but do not have a EPA # because United Kingdom has different regulations than the US. 

Merial Limited stated that it is probably the same product but they CANNOT stand behind their "Satisfaction Guaranteed" without a EPA # because it is not meant to be used in the United States but only for the country that it was manufactured for.

If you have any questions concerning Frontline, Merial Limited can be reached at 1-800-660-1842. They are extremely nice and helpful.