Security researchers have uncovered a new phishing campaign in which fraudsters send physical mail to owners of Ledger and Trezor wallets, impersonating official support. The letters use convincing logos and messaging to push users toward fraudulent websites that ask for recovery seed phrases, which are private keys that grant full control of crypto assets. This offline tactic aims to bypass usual email and SMS filters. Experts strongly advise never sharing or entering seed phrases online and to always verify support contact details through official company channels to avoid theft.