The easiest way to check would be to look at your protocol PDF (assuming your data come from a Siemens scanner). With the CMRR MB-EPI sequence, you can find the value of the “EPI noise scans” field under the “Sequence - Special” card. If it’s > 0, then you have noise scans at the end of the scan.
Otherwise, you can look at the files with an image viewer (e.g., fsleyes). If you go to the last volume in the series, it should look basically like white noise instead of a brain if it’s a noise scan. Just move back from that last scan until it looks like a brain again, and that should tell you how many noise scans you have.