Looks like it's just a 2x3"ish sized tip on a regular muffler.
Don't let the seller push you around. It is your money you're spending, and if they won't accommodate you, sometimes you have to be prepared to walk. Afterall, they want to sell you a car, and should be putting on a good show to do as such. If there are any things you are concerned about, share them with us. Maybe someone local to the seller could even go check the car out more closely for you if you're lucky?
Cheers, Gav.
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