timing belt/water pump/thermostat on 1998 Honda Civic

Purchased pre-owned car from dealer/shop. Had it checked by third party mechanic. Recommended timing belt/water pump/thermostat be replaced (68,000k). Seller replaced belt but not pump or thermostat stating both appeared to have been replaced. How can I be sure?

Asked by for the 1998 Honda Civic
when the pump goes, coolant gets on the belt which in turn renders it junk. it's best to change all 3 when digging into the engine that far. it saves you money in the end also.