Any repair history caps a tire at Grade C, disclosed. Below C there is no grade: unsafe tires are rejected and never listed; sound tires that miss the floor stay off the marketplace, unbadged.
Shops also list never-mounted tires, marked New instead of a letter. Grading measures wear, and a new tire has none, so there is no report. It still gets a photo of the actual tire and the same NHTSA recall screen as every listing.
If the shop records the DOT date code, the listing prints the made date and the same 10-year ceiling applies. No date means the shop did not record one, not that the tire is fresh; the code is molded on the sidewall, so you can read it at pickup.
"Safety" items reject the tire outright. "Disclosed" items cap it at Grade C and appear on the listing. "Automatic" is screened for the tech: brand, model, size and DOT build date against NHTSA's tire recall list, refreshed monthly.
Three tread depth measurements, a photo of the tread face, a photo of the outer sidewall with the DOT date code, the inspection checklist, and a full photo of the tire. The whole report renders on the listing, next to the price.
A matched set is graded once: the shop inspects every tire, measures and photographs one, and the listing says so. The shop also reports the lowest tread across the set, and the set is advertised at the grade its worst tire can hold. A tire below the Grade C floor is never part of a set.
A tire with an unsafe condition is rejected: the record is permanent and it can never be listed here. A sound tire that misses the Grade C floor is simply ungraded and never listed. A grade says what was measured on the inspection date, nothing more.