I'll go out on a limb and assume it was the bottlecaps in the chandelier...Many years ago my friend held a party when his mom was out of town. We created a drinking game that was based on tossing bottle caps into the chandelier type light. We had a great time and everything went smoothly. Recovered from hangovers; cleaned; vacuumed: put everything back. Trash day had even come. Tracks were covered. A few weeks pass and is mom figured it out. Can you guess what was missed in the cleanup?