I'm curious as to where these came from. You say they were from a museum. Were they stolen? And if they were dug up in Mexico, where in Mexico and when and by whom. Maybe they are Aztec or maybe they are from last week. If you really want to know what they are worth you need to document them a little better. No body on this site can authenticate them for you, especially without seeing them. You need to find someone who is knowledgeable about Mexican antiquities to give you a better idea of what these are and if they are authentic.