Buy from halfcut shop izzit? You need to know the date, usually max is 10 years from manufacturing date.
2nd is the tires all season, summer or snow tires? If snow just skip, too loud to drive on the roads.
3rd is tire condition, is there any long/deep cracks on the sidewall or treads? Treads depth still ok?

Usually we only buy imported used tyre for training purpose, like to go for drift, track or gymkana traning rounds. If lucky can get performance tires at cheap price, but those are not suitable on-road and only on competition gound.

Those shop also sure got mix with half-cut tires. As per same need to identify the tires type, manufacturing date and condition before buy.