Filed the h4 extension via dropbox still didnt get the receipt number
Your question is incomplete.
What kind of receipt number are you expecting here?
we filed the H4 EAD extension for my wife and we sent the documents and application along with 520 dollars cheque to lockbox. its been more than 15 days the cheque is not cashed yet and we didn’t receive the receipt number for our filing.
If the mail was delivered, then you should be fine.
I heard that there are delays in issuing receipt numbers (about a month).