I've been using Bubalus Bubalis since last October and buy it locally in Los Angeles. It is delivered to the store I get it from twice or three times per week. If unopened it should easily last ten days to 2 weeks. Just purchased, but opened and resealed with no air, but in its original liquid (buffalo milk and whey), I've gotten a good week plus before it started to smell off and fall apart. If you just bought it and it doesn't have a pleasant smell, then you should return it. I have never had to return it. Also, buffalo milk is more sour/tangy than cows milk, so there is that fact to take into consideration when testing for off smells and tastes.
Just FYI, I tried their smoked mozzarella di buffala (scamorza) today, and I thought it was excellent: delicate, smoky and flavorful. Good stuff.