回複：Your problem resolved

his company's problem solved, his illegal work problem continues without EAD approval. There are many types of I-766 eligibilities, each with different grace period, etc. It's too much information for the employer to understand the difference of each type of EAD categories, so if they check your I-765 pending for 90 days, they have done their due diligence and won't be punished for hiring illegal workers. However, it's your responsibility to know that whether you can work when your EAD category expires. The answer to the c-9 category EAD is, no, you cannot work even for one day after expiration.