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Have you ever had this bad experience, friend? It seems that if you share your experience of how the problem occurred, it will be more helpful for someone new so they don't repeat the same mistake. I realize that security for cold wallets has received good feedback from many people, but with rumors like this, I have doubts about your statement.
I don't take lightly the warning you gave. However, I am a little surprised about this, because there is also a bad possibility for someone who wants to buy a cold wallet like Trezor and Ledger. Spontaneously in my heart I said "What... how could that actually happen?"
I didn't have the experience but there are stories shared in a local group in my country about this, they bought it at a vendor that's not the seller for Trezor and when they transferred all of their altcoins in there, they're surprised and saddened by the discovery that all the altcoins and NFTs stored in there is gone because they've somehow faked the anti tampering of the wallet to make it look like it's safe at first glance. I don't exactly know how these scumbags do it but they have a way of tampering it, iirc Trezor has a seed phrase right? They might've done something about that part. You don't need to worry too much, just buy it on the official store and you'll know that you're safe.