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That is what this discussion started with: get a Trezor from official site with seal. Reflash the firmware if you are this cautious.

FYI I have a huge chunk of my net worth inside one of it, I have no lesser concern than you on the security issues.

I shall thank you if you can pointing out any better options over hardware wallet, which so far you have not. Please feel free to enlighten me further.

I did in my initial post....