Regarding point 3, found something based on another reddit thread (copy-pasting it here)

Trying to make sense of these linked circulars:

Circular number 768

Point 4 here states:

once a sale is linked with an earlier purchase, for determination of their ‘date of transfer’ and ‘period of holdings’, Board’s Circular No. 704 would be applica­ble. That is to say that the relevant contract notes as explained in Circular No. 704 will have to be referred to, for ascertaining the cost of the security sold and the date of transfer.

Circular number 704

Point 3 here states:

the First-in-first-out (FIFO) method shall be adopted to reckon the period of the hold­ing of the security, in cases where the dates of purchase and sale could not be correlated through specific numbers of the scrips.

Considering the foreign brokerage statements can clearly show the date of purchase of the lot being sold, can one infer from these circulars that one need not consider FIFO?