Use a tote large enough for the animal to fit in. Drill a hole in the lid large enough for the animal to fit through. Put treats inside. Use clear or opaque so they have to find the treats in the dark.
SOOO cool for raccoons! Maybe could have an extra area to let people see new enrichment we are 'building'. And 'build this out of tp tubes and cardboard? Pre-make cardboard circles and squeeze tubes into?