hayan falsificado
-they/you have forged
Antepresente de subjuntivo para el sujeto ellos/ellas/ustedes del verbo falsificar.

falsificar

Es posible que los bienes sean de valor muy inferior o insuficiente, se hayan falsificado o manipulado de forma que reduzca apreciablemente su valor.
Goods may be of greatly inferior or little value, counterfeit, or may have been tampered with in such a way so as to significantly reduce their value.
Eso no significa que lo hayan falsificado.
That doesn't mean that they're falsified.
Palabra del día
la leña