H1B case approved. But did not receive I797 B

[Charmi_Bh]

My H1B receipt number/case got approved last year in Apr 2023. Due to some reason, no document (I797B) was shared by my employer for me to go for stamping. Is there any provision to find/get the approval notice (I797B) directly from USCIS when employer refuses to share documents ? If so please could you let me know the procedure ?

When I checked in Freedom of Information Act (FOIA) portal on the whereabouts of the I797B, I was told, no such document is found. Please see the screen shot below. What does this response mean ? 

The case is approved but no approval document found. Are there any scenario where the approved document is not found due to employer's non-fulfillment of requirement ? 

Thank you