A Polish trader has revealed deceptive practices used by some blueberry sellers to defraud customers. The warning, reported by Fakt, centers on the sale of wild blueberries in containers that are misrepresented in volume. Specifically, some vendors are selling 0.8-liter portions of blueberries while claiming they are one liter, effectively overcharging buyers. Consumers are advised to be vigilant and carefully check the quantity of blueberries they are purchasing. This practice exploits the trust of customers seeking locally sourced forest fruits. Authorities have not yet commented on the allegations, but the report urges buyers to remain cautious during transactions.