One of the Prestige challenges in the Lead and Paint series, only available to Battle Pass owners, will ask you to search chests in containers with windows. With the arrival of this tenth season, a new series of challenges has emerged, the Prestige challenges. These are unlocked automatically once all the normal challenges have been completed, and are normally a little more complex, but will grant even more rewards.
Thus, after completing all seven normal Lead and Paint challenges, new ones named Prestige will be available. One of them will ask you to search chests, but not just any, since they must be in a container with a window drawn on one of its walls. It will be necessary, in total, to do it five times, in one or more parts.
To help you in your research, we have indicated the location of these containers on the map below.