The phrase "were found at" can be replaced by several synonyms to add variety and enhance the flow of written content. Some alternative phrases include "discovered at," "located at," "uncovered at," "sighted at," "spotted at," and "observed at." Each of these phrases conveys the same meaning as "were found at" but with a different tone or emphasis. For instance, "discovered at" implies that the finding was unexpected or significant, while "located at" suggests a deliberate or intentional search. In summary, having a variety of synonyms for "were found at" can make writing more engaging and dynamic.