Which date does USCIS consider as "date of filing" for H1B visa transfer?

USA H1B Visa
1

  1. Which date does USCIS consider as “date of filing” for H1B visa transfer? The date the packet was shipped or the date it is delivered?

  2. Can we in-person deliver transfer application at Los Angeles office?

Thanks in advance.

2

No in-person delivery is available. The date it is delivered is considered the receipt date by USCIS.