Just tell them it's a hardware wallet and they can search it up. It's 2022, lots of people have these devices.
When entering any country, there are restrictions on the import of funds. The receiving party, if its representatives at the airport understand the purpose of ledger or other hardware, are simply obliged to check the balance of the device. Therefore, I have doubts whether it is worth saying that this is a hardware.
I see several scenarios:
1 - You are transporting hardware under the guise of a flash drive.
A successful outcome is possible if the airport doesn't know the purpose of this device. Otherwise, you will have to explain and show a balance for the reason described above with all the ensuing problems.
2 - You don't carry a device, but carry seed-phrase with you in a text or other form and buy a device already on the other side of the border. In this case, seed-phrase should be hidden very securely and should not be shown to anyone.
The world is constantly changing and I don't exclude that in the near future, with any attempts to cross the borders, restrictions will be introduced and hardware devices will be checked.