We have something for you! There is a Supplemental Pipe Band Roster Form the needs to be submitted at least two months before any RSPBA contest in which you compete.
The Music Board receives requests all the time from the RSPBA to verify rosters; yes, they do check. You can get the form from the following link. Two copies go to the RSPBA and one to EUSPBA.
RSPBA-Home Association Supplemental Pipe Band Roster Form 2019 Season Rev 5.pdf