Replaced single tire after blowout

[gtg708q]

Long story short, I had to replace a single tire on my 2008 Spec B after a blowout in the front passenger tire. I had the stock Bridgestone RE050s with ~30k miles on them. The tire place I went to only had ONE tire in my size and it was the Pirelli PZero Nero all season. I had to drive a long ways home so I went with it (the store had no problem putting only one tire on). Anyways, I ended up putting ~200-300 miles on the car with the one new tire in the front. I know this is a big no-no, and the remaining 3 have recently been replaced. My question is, should I be worried about damage to the differentials? I dont notice any sounds or vibration. Is there a way to check for damage? And is it worth changing the diff fluid? Side note I just changed the front and rear diff fluids at ~36k miles (I now have 40k). Thanks for the help!