all mine that I paid $2.49 for are DOP CERTIFIED and have various serial #s, some that start with 2 and some that start with 4.
All my "Product of Italy" cans are san marzanos according to cento, and costed me $1.69 for a 35oz can that when shaken made very little splashing noise--I didn't count the exact # of maters but they had many more than the $2.49 can. Not only did they cost 32% less, they had in theory 25% MORE product. Also, all cans had the ROA stamp, that is, the digitized code on one end of the can started with "ROA." Jeff Varasano may be able to add more about this.
Ironic we spend so much time on this subject of whole peeled tomatoes, especially since, in the last taste test of whole peeled tomatoes, America's Test Kitchen's top 3 recommended varieties were actually
1. Progresso Italian-Style Whole Peeled Tomatoes with Basil ( "The winner in all three tastings. "Mmmm—bright, lively flavor and silky texture," said one taster. "The perfect balance of acidic and fruity notes," said another. Some disliked the basil, but all were impressed with the firm, fresh texture. Fairly salty." )
2. Redpack Whole Peeled Tomatoes in Thick Puree ( "Were it not for the slightly "processed-tasting ketchup quality" of the puree, this "bright, sweet, and balanced" brand might have come out on top. Tasters liked the bold acidity and the full flavor, but some noted minor "metallic off-tastes." )
3. Hunt's Whole Tomatoes ( "On tasting the quick sauce, one panelist said, "This one tastes the most like ripe, fresh tomatoes." But a few tasters found Hunt’s too mild in the long-simmered sauce." )
I got a kick out of Tuttorosso, which finished next in line, ("Basil—with just a hint of tomato," joked one taster, referring to the prominent herbal notes. But even those distracted by the "vegetal, perfumey" overtones had to admit that the tomatoes underneath were bright and nicely balanced, "like freshly picked garden tomatoes." )
Tuttorosso had the most weight of tomatoes in a 28oz can too: 12.8oz.