Received it by email

On that day USCIS received my petition, I got an email from USCIS said Receipt Notice will follow in the mail. (Actually, it was our international office got this email and forwarded it to me). Then, after 2 days, the USCIS website displayed that my case has been approved. Also, I got an email about this approval notice. This morning, out internaional office noticed me that they have received the hard copy of my approval notice from USCIS, they will mail it to me. Any questions?