i saw it in a grocery store in Shumen, Bulgaria 3 years ago... price on the shelf was like 30% higher than the sticker on the product, many durable food goods were this way
they don't put labels on them because they don't want people to notice how much they have gone up when they go to the counter, and you can see that they are replacing the shelf labels a lot more frequently than they used to
hyperinflation is practically here, leaving labels off the shelf so they can adjust them in the database is a blatant sign that price changes are shocking to consumers, would explain why retail in general is tanking