I used to go on Comichron and checked out the sale estimates for certain DC comic books ,but I can no longer do that.
Working for DC is the only potential way of knowing.
Sorry. I know that’s not the answer you wanted.
Find a US dealer that bought a case from the distributor. The case label lists the number of copies in a sealed case and the number of cases shipped to the distributor. In the US, there is only one distributor.