I’d wager this photo was taken in the fall and these are probably Asian ladybugs. Ladybugs generally will aggregate in an outside location suitable for overwintering (e.g: under tree bark). Asian ladybugs specifically have a preference for human structures and as you’ve seen, get into everything. Sometimes they dehydrate and die, leaving you little memories of their past lives.

Fun fact. The ladybugs you buy at the garden store in the spring are often collected during this diapause period.