Just ask for direct assistance in their announcement thread here:
https://bitcointalk.org/index.php?topic=2072589.0, that's the only way you could get a definitive answer from your question. You could also just use another provably fair tester along with the ones that they sanctioned just so you'd have the peace of mind that they are not screwing you over. As for mines, I don't really know if such a feature exists since those games are randomized at best although you can try scouring the internet for answers for that. At the end of the day we can guarantee that your doubts over the validity of odds in stake are understandable and fine, but would be clarified once you find the proper answers you're looking for.