docs: private JSONObject getCachedGUIDs() {
          JSONObject cache = null;
          String json = getStringFromPrefs(Constants.CACHED_GUIDS_KEY, null);
          if (json != null) {
              try {
                  cache = new JSONObject(json);
              } catch (Throwable t) {
                  // no-op
                  getConfigLogger().verbose(getAccountId(), "Error reading guid cache: " + t.toString());
              }
          }
  
          return (cache != null) ? cache : new JSONObject();
      }