I don't think it is legit because no casino is checking if the games were faulty when someone loses 50K. Some casinos will have 100s of thousands in net revenue in a day, do they check if the games were faulty, because people lost so much?
What do you need to check? There are so many diagnostics built-in, any casino can analyze the gameplay in minutes. If it is anything like what Microgaming is offering casino operators, then they can nearly count the number of farts from a player during a session.
Two weeks, are they still using pigeon mail or horse couriers?
Didn't mean they are legit casino, but that legit casinos also do complete gameplay checks which sometimes delay withdrawals. Providers receive punch of these requests, through casino module you can see everything what have happened but not able to see possible malfunctions what they for some reasons willing to check for some big wins (never heard any found yet though). Many accrited casinos here have escalated these checks to providers so that itself don't really tell much about anything. MG game module is probably worse to exist, maybe they upgrade it to this century sooner or later, but yes, all casino modules you can have access to all gameplay histories and everything but that's not really helping in checking if there have been errors or not.
Have you ever escalated some requests to game provider? Two weeks can be very reasonable time to give, they get these stuck gamerounds, requests to be checked and all other requests from XXXX (how many casinos are in the world?) places and mostly don't find your request to be P1 to pass all others and get sorted. Waiting over week reply from game provider is really not a miracle, guess most of reps can confirm it, no need to use horses, they just get so much shitto to be checked without any valid reasons (maybe they are not very fast with purpose and try to decrease amount of stupid questions escalated to them).