How do you know that Ali was a familiar figure at post-office

How do you know that Ali was a familiar

figure at post-office? 

Answer: Ali was a familiar figure at post-office. We can say this because for five long years,he had been a regular and in fact the first visitor of the post- office. 

Even bad weather could not deter him.Hepatiently sat on the same bench everyday waiting for his name to be called. The postmen made fun of him. 

Even though there would be no letter for him, they would call out his name, just to see his reaction. He was an object of mockery at the post- office.