I seriously doubt that your items are more than 50 years old and I am being generous with that timeline !! Making and ageing these things is a cottage industry in many parts of Mexico !! Most are sold to tourists !! While I was looking yesterday I ran across another deer item that had a similar crack across the nose that was on ebay !! It was made a little different from yours !!
And keep in mind that many things on ebay are fake !! Like the listing you bought,, the seller never said that these things were part of that group !! He just provided the information for you to read and you made the assumption that it was from that excavation !! He didn`t lie,,so you can not fault him for that !! Can`t even leave neg. feedback !!
I have watched many sellers like this,, they are an education in what not to do when buying on ebay !!