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if thrown away or get lost is the assets onboard going to remain safe if the founder know nothing about the key 🔑?
It depends on the hardware wallet. In some cases, it is possible to hack a hardware wallet if there is physical access to it. There are also hardware wallets that cannot be hacked easily, even with physical access.
If you lost your hardware wallet and do not know where it ended up, you should consider it compromised. If this happens, use your backup seed phrase to immediately move all funds to the new wallet.