I'm trying to dig up more info on the "The Caches" which is near the suspected hiding place of the silver. In 1823 the Baird/Chambers party hid trade goods there for a reason beyond me. If Martinez was a veteran of the trail i'm sure he knew of that place and if he wanted to carry the silver there he could have.
aerial view of The Caches
Santa Fe Trail Site Aerial Photo of The Caches