Visas in Chile: Personal experience
The first time crossed the boundaries of Argentina-Chile by bus from El Calafate in Puerto Natales. In the bus issued a questionnaire (quarter of A4 sheet), it is necessary to fill in English or Spanish. Presented a passport and questionnaire. All things enlightened through the X-ray (it is impossible to import anything edible), no questions asked. Reverse ticket, insurance or finance did not ask at all.
The second time a similar bus transition of Bariloche (Argentina) → Puerto Montrtes (Chile). Also a questionnaire + passport and no questions.
Then crossed the border with Peru – I saw that no questions ask.