I am a lawyer. You can try filing a claim in small claims court against FedEx, and they might settle just to avoid the expense of sending a lawyer to court. If they do choose to go to court you will likely lose, since there was no external damage to the box. If the electronics was shipped in the original carton with the original foam inserts, and the remote was properly placed in the inserts, then the manufacturor is probably liable. This is based on the theory that the shipping carton did not properly protect the electronics in shipment. I would certainly press the manufacturor for a new remote. A remote will cost them very little, and they need to improve their carton.
Good Luck.
Good Luck.