请问8老师 绿卡批早了咋办

Dear Teacher 8:

I am very suprised when my PR case tracker sent me alerts. I see "Case Was Approved" and "New Card Is Being Produced" status in last two days, but my Priority Date is still not current yet (there is still 3 months away from the final action date in the visa bulletin). 

My question is what should I do once I have received the card:

1. Keep the card without doing anything. what is the impact/risk down to the road?

2. Return it to somewhere of USCIS? Call them or go to local field office?

Thank you very much!