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Imo checking the authenticity of the hardware from the firmware side would be hard, if someone develops a replica lookalike Trezor, they would most likely be able to replace any checks in the firmware (or develop a custom firmware).
If you ordered directly from the Trezor shop and the holographic seal was fine, you are probably good to go (do further research if you have any doubts).
For the RNG generator, it appears that they take a random number from the Trezor device, as well as from your connected computer to derive the seed. (source: [https://wiki.trezor.io/Recovery_seed](https://wiki.trezor.io/Recovery_seed) )