Update: Checked today morning and see the following:
On ociservices.gov.in: Status is : UNDER-PROCESS. Date of acknowledgement: 16-FEB-2022. Until yesterday (or maybe until day before yesterday), it would show NO RECORD FOUND.
On BLS website, there are two lines:
In Transit from Consulate General to BLS Centre
Processing at Consulate General
Until yesterday, both lines were 'Processing at Consulate General'. I suppose first line is for returning the original document, second line is for the OCI booklet.
I'll give another update when I receive the original from purolator.