I popped up here incidently. Actually after spending 5 years in the tire corporate world I could no jumping in here. Sorry for the interruption guys.
Actually the normal rack life for the tire is 5 years if they are stored in cool and dry place.
@asjad is right here to some extent.
@naxun
Actually those people cry who buy used tires as normally what the dealers do that they make the threads of the tires by getting it hot to a certain temp and then use "SOWA" to make new and deep threads. That destroys the tires.
If these tires as the seller is mentioning are stores as he is saying I see no harm in using them. But the prices quote by @asjad are little higher as he might not sell these tires on them but little less.
who ever is buying should check the tires thoroughly specially the thread area and check for suspicious activity. if that is not there then, go ahead and buy them.