It is true that the flight recorders were reported to not be tampered with. It is still suspicious why they did not hand them over at first, and they did not allow access to the ruins for a week. You cannot surely believe that it does not look suspicious.
I don't know what happened with the audio recordings of the Air Traffic Controllers. Surely the Ukrainian government has them. Were they released?
Did you know they have a phone call recording of the separatists claiming that they had shot down a military plane? Then they realised that the plane wasn't military, but civilian, and told everyone in their group to keep it quiet. This could have been faked by the Ukrainian Government but it might be true.