Let's see–you took it out of the freezer and sent it to an air conditioned post office. They then put it into the cool belly of an airplane, on to another air conditioned post office and delivered to the destination, where it sat at room temperature until your friend picked it up. The only question I have is how did your friend take care of it once he/she received it? This might be the weak link, as all the other places that the stew has been have been conducive to short term shelf stability for a dehydrated and vacuum sealed meal. Did it sit in a warm backpack for several hot days, and then cool down a bit each night?
I think I would just simmer it a bit longer than usual to kill any possible cooties, and give you a big thanks for providing such a great meal. But that's just me…