Paid for new Cat. converter last year. This year told no way new converter?? on 1999 Honda Civic

Is is possible the converter went bad in a year? I was told its good for 10 years or 80,000 miles. I paid the mechanic who put it in $800 cash for a factory converter. Different mechanic this year tells me no way the converter is new? Did this guy rip me off?

Asked by for the 1999 Honda Civic