Afaik warranty doesn't cover it because the "sealed" is more about small splashes than real rain or larger amounts of sand ... The only really sealed camera bodies are the 1d series, with everything else it's a gamble.
For my semi-sealed 60d (and probably also the 6d) I feel safe shooting when it's snowing or in very light rain for short amounts of time, but that's about it. But from what I've read non-working buttons work again if it wasn't salt water and the camera was dried to avoid pcb corrosion.
Bummer about the "sealing". Then, maybe they and everyone else shouldn't say that they're "Sealed/weatherproof/weather resistant" at all. Maybe the only weather resistance is that one should resist taking it out on bad weather.
Thank's heaps about your opinion on malfunctioning buttons working if the camera is dried. That gives me a peace of mind. My camera is now enjoying a rice bowl. I'll give it two days before I try again. I'm going to need my rice back!
I have previously tried those wet-bags for DSLRs that I bought a shop called Ryda in Oz. Luckily my friend suggested I fill them up with weight and tissue paper. I tested them by submerging them about 30cm. The first bag I had leaked. The second bag also leaked. I gave up on them.
Anyways ... hopefully, in three years I'll have enough money to get my 1d'ish camera and then I will be unstoppable!