http://www.roarracing.com/downloads/..._Rule_Book.pdf
Page 38 8.3.2.2
Both the top and bottom sections of the case must be secured
together by glue, double-sided tape or heat seal with a label across the seam
stating "ROAR Approved" in such a manner that separation of the case to
remove or replace the cells will destroy the case and/or label and render it
unusable in competition.
Thats just a small section of the rule, so yes it does need that sticker on it