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Again any assurance would be very appreciated.
None of us could assure you that what you're going to buy from unofficial stores/sellers aren't tampered.
Just order from official website and official resellers
(link provided in previous comment). By the way, Trezor came up with some security measures against tampering starting from packaging up to software safeguards.
In security design, a tamper-evident hologram or holographic seal makes unauthorized access to the protected object easily detected. A package with TREZOR One is protected by two silver seals on both sides and is wrapped in a thin plastic foil (removed on attached pictures). The packaging is carefully sealed with a strong glue.
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Apart from the physical tamper-evident hologram, our devices also use software safeguards against tampering. The device firmware and bootloader are signed by SatoshiLabs, and these signatures are checked whenever you start the device. The TREZOR will warn you if the signatures are invalid. Apart from that, we dispatch all of our devices without preinstalled firmware. Therefore your can conveniently check that there isn’t a preinstalled malicious firmware.
Yea i picked it up on amazon via the official reseller for the region.