If you're asking whether there's any substitute for the bobbin case then no, there is definitely not. When I lose something I sometimes panic, and then I can look in the same place 50 times and not see it there. Sit down, have a breakfast beverage, relax, think about where it might be, why it might not be in the sewing machine, and then search methodically and calmly, with the idea that it will turn up.