Can you flash fake SMART data to drives? I suspect that's exactly what Maestro will start doing now (although it's possible it's not worth the effort for the small number of customers who will actually check this stuff).
The best you can do is check FARM if available and perform a long burn-in with something like badblocks. Then compare the SMART data before and after the burn in. Checking the serial number against the manufacturers database if available is also a good precaution.
These are probably things you should be doing whether or not the drive is allegedly new.
[1] https://www.heise.de/en/news/Hard-disk-fraud-Larger-disks-wi...
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