You have some grace period. I think it is 30-40 days. Also, I have reason to believe that your employer's attorney forgot to send the package and is blaming the situation on Fedex. Ask them for more evidence because if this is really true, you can sue Fedex for amount exceeding $5 Million for 'absolute loss of livelihood and subsistence'. Get the previous tracking number from attorney or HR and get verification from Fedex that a certain package was indeed lost.