GST Return issue

 Sir/Mam, Due date to file GSTR-1 for June quarter was 31/7/20. It was extended to 3.8.20 due to Covid. I filed GSTR-1 on 6-8-20. Query- Late fees will be from 1-8-20 to 5-8-20. So, Late fees should be paid for 5 days (i.e upto 5TH Aug only) or 6 days (i.e. including 6TH Aug also) ?

2) Mam, I want to know that what Deptt will do in  scrutiny of Returns ? Whether Scrutiny of Returns by GST Deptt means matching of GSTR-3B with GSTR-1 ?? 

3) Whether deptt can also match GSTR-3B & GSTR-1 with P&L , B/S , if they call P&L & Balance sheet from assessee in case of scrutiny of returns ?

Thanks..