The Central Vigilance Commission (CVC), which was asked to give its opinion on closure reports filed by CBI in Preliminary Enquiries (PEs), has already submitted its findings on 25 such PEs.
The apex court had sought the assistance of CVC in view of divergence of opinion between the investigating officer and superiors over their closure reports.
The Commission has opposed closure of several of these PEs in their findings submitted to the Supreme Court, official sources said.
"We have received information and relevant documents related to remaining coal blocks from CBI. The Commission is scrutinizing them," an official associated with the probe said.
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CBI has registered 20 FIRs to probe alleged irregularities in allocation of coal blocks.
The apex court had on March 28 asked CVC to peruse the coal blocks allocation cases in which there was a difference of opinion within CBI on their closure.