As of May 3, 2017, USCIS has just completed data entry for H-1B cap cases received last month. All receipt notices and rejected petitions are now being sent. Based on experience from past years, it could take weeks for all notifications to be sent.
We have received many calls asking if all hope is gone for H-1B lottery selection. This announcement makes it clear that the answer is No, Hope is Not Lost! As in past years, the data entry, mailing and notification process takes time (weeks, even a month or two). Just because you've heard of others who have received receipt notices, or even rejected petitions, that does not mean all notifications have been sent. USCIS only completed data entry two days ago - the time for processing receipts and rejection notices, and then mailing out all those notices, takes time.
We will not know the status of your case, and will not have a case number, until a receipt notice or rejection notice is received. As stated in its announcement "Due to the high volume of filings, USCIS is unable to provide a definite time frame for returning these petitions. USCIS asks petitioners not to inquire about the status of submitted cap-subject petitions until they receive a receipt notice or an unselected petition is returned. USCIS will issue an announcement once all the unselected petitions have been returned."
We will keep you updated as new announcements are released!