habrán averiguado
Future perfect ellos/ellas/ustedes conjugation of averiguar.

averiguar

Lo habrán averiguado ellos mismos.
They must've found out on their own.
Quiero decir, para cuando llegues allá, ellos ya lo habran averiguado.
I mean, by the time it takes to get there, they'll know if it's a warning or not.
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Christmas