However, randomised MAC addresses are normally flagged as 'locally-assigned', per the IEEE 802 standard, which could become an indicator of 'something to hide' if most devices use fixed globally-assigned addresses. (I don't know how true that is; quite a few Linux network device drivers support boards without NVRAM fitted, for which they generate a random address at boot.) Even if you decide to violate the standard and 'steal' a globally-assigned address, you'd then want to be sure to pick an OUI (22-bit manufacturer ID) that has actually been assigned.
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