First of all, I would like to thank you for sharing your experience with us because most of us have not been to a physical casino.
In any case, I believe that both land-based casinos and online casinos can easily rig the results of their games and slot machines.
As far as I know, there is no printout of what your odds were at the time of each spin and how they matched up with the chance of winning. For example: some numbers coming up and an indicator of how much this number falls into the series of winning numbers. I think it would be fair if such a thing were provided.