I feel the answer is becoming repeated. I already answered it many times but anyway here it is again. It's completely possible to hire an embedded programmer and change the functionality of any device. Leger is close source, you as an end user can not verify anything if anyone do any trick.
It would be interesting if the Betnomi scammers were able to find some experienced blackhat willing to do that for them, but in reality I can't consider that possibility to be an accurate one unless they've spent too long organizing and shipping the hardware wallets from the giveaway (so unfortunately I think it might be credible... in any case just throw it out and don't trust hardware wallets from giveaways).
I would prefer not to trust any device not purchased from an official manufacturer at all. Even if the betnomi had not done an exit scam, I would have thought 10 times before using such a wallet to store major cryptocurrencies. Why create unnecessary risks for yourself? I admit the possibility that on hardware wallets received at various raffles and other contests (that is, not purchased directly from the manufacturer) you can store only a small amount of money, which is not a pity to lose.
I don’t know about throwing out betnomi's ledger, but you definitely shouldn’t trust 100%. You can 100% trust only those devices that were purchased directly by you directly from the manufacturer, preferably without intermediary stores.