Probably threw it out the window. If they were leather workers, they might save it to use as a tanning agent. Anyone in the cleaning business might save it for its antiseptic and ammoniac properties. Perhaps most interestingly, however, they might sell it to a local gunsmith. Urine contains potassium nitrate, which is one of the main ingredients in gunpowder; urine was actually one of the most common sources of potassium nitrate for a significant portion of the history of firearms.