I'd let them know you expect them to either find your other items or make you whole. But at this point, I think you should give them a chance to search for them.
Perhaps @caannie will chime in because she had a similar experience with Fashionphile. IIRC, she sent several items in one shipment and they claimed to have not received an LV wallet. Eventually, it was located.
Thanks, they responded saying they will follow up with fedex. As if FedEx was to open my box, take some items and put back the wallet. Please! Lets see what happens, there's no way I will let it slide because they don't know how to run a business.