My mate had a similar issue, the case he was after had been updated and made slightly bigger, the newer version not fitting in his car boot. He saw an older version online and messaged the retailer for dimensions, specifically measuring the actual case in stock, not the manufacturers spec, which they agreed to do and replied with, and fortunately for him it was the old case sizes. He placed the order, received the case, which was the new version. So he returned it at their cost.
Moral of the story, you can only trust in something when you have it and can test it yourself, the person on the other end of the phone/message could be a very helpful individual, willing and eager to help a customer. Or they could not.