private void addLocalSpoilersTo(@NonNull final List<Image> spoilers) {
        if (StringUtils.length(geocode) >= 2) {
            final String suffix = StringUtils.right(geocode, 2);
            final Folder spoilerFolder = Folder.fromFolder(PersistableFolder.SPOILER_IMAGES.getFolder(),
                    suffix.substring(1) + "/" + suffix.charAt(0) + "/" + geocode);
            for (ContentStorage.FileInformation imageFile : ContentStorage.get().list(spoilerFolder)) {
                if (imageFile.isDirectory) {
                    continue;
                }
                spoilers.add(new Image.Builder().setUrl(imageFile.uri).setTitle(imageFile.name).setCategory(Image.ImageCategory.OWN).build());
            }
        }
    }
Add spoilers stored locally in <tt>/sdcard/cgeo/GeocachePhotos</tt>. If a cache is named GC123ABC, the
directory will be <tt>/sdcard/cgeo/GeocachePhotos/C/B/GC123ABC/</tt>.

@param spoilers the list to add to
main/src/main/java/cgeo/geocaching/models/Geocache.java