I realize it has been some time since you posted this message, but, if you haven't received a reply I may be able to help you with the information regarding Joos and Tuffli from Switzerland. The Tuffli name is very uncommon and is found in the Prättigau valley of Graubunden Canton. The Joos family is also common in that same area. I don't have records after 1875 for that area but there are a number of local histories published there that might help you with your search. If you have any additional information regarding this search or have questions, contact me.
Ray