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First of all you'd want to check if it's the same Goodyear EMT tire that these cars come with. If it's another brand then you know for sure they have been replaced. But assuming that the tires on there are the Goodyear EMTs but you're just not sure if the previous owner replaced those with another set, the best way is to check the date code on the tire. Every tire manufactured has a date code on it, and so for example if the car you're interested in (have you found one yet by the way?) happens to be a 2003, and the tires have a date stamp of something like August 2006, then you would know for sure that they have been replaced.
First of all you'd want to check if it's the same Goodyear EMT tire that these cars come with. If it's another brand then you know for sure they have been replaced. But assuming that the tires on there are the Goodyear EMTs but you're just not sure if the previous owner replaced those with another set, the best way is to check the date code on the tire. Every tire manufactured has a date code on it, and so for example if the car you're interested in (have you found one yet by the way?) happens to be a 2003, and the tires have a date stamp of something like August 2006, then you would know for sure that they have been replaced.
I am hoping to go look at a car tomorrow.
Do you have any more info on the date stamp, where I find it and how I read it?
Look for a raised DOT followed by a series of numbers. The last one will be something like 4003 ( from a tire on my 04) which means the tire was made in the 40th week of 2003.