I do not think any of it is fake. Perhaps there are some things that are presented to build more drama. The search for Aztec gold is certainly for real based on the money being spent in the search for it. I had never heard of gallium, but obviously someone and probably a lot of someone's went to a great deal of time and trouble to smelt it. What on earth did they use it for? What was the motivation? The really big next question is who and how did these people bore out rocks with primitive tools. The boring looks perfect and very smooth too. They certainly went to a good deal of trouble to hide these rocks. I would bet there is gold there too as the Aztec gold the Spanish witnessed was all gone when they returned a year later and nobody has ever found it.