Even though you distribute the OTP physically, you are still susceptible to hacking whereby the OTP stored on USB can be read. You are not limited to "physical theft" only. There are a one option for mitigating this risk:
Even though you distribute the OTP physically, you are still susceptible to hacking whereby the OTP stored on USB can be read. You are not limited to "physical theft" only. There are a one option for mitigating this risk: