A midnight-blue box with Blockbuster-gold trim, its surface rippling with constant tracking line distortion like a corrupted VHS playing in an endless loop. The lid bears a faded 'BE KIND REWIND' sticker that glows faintly when approached. From within comes the soft whir of an idle VCR motor. It contains infinite compartments that can never be filled, growing heavier with each recording it holds. It only opens when presented with valid attendance evidence.

The Tracking Box serves as the Chaintrix's primary evidence storage - all performances are recorded here, and only properly tracked recordings count as valid attendance. It judges whether players have maintained 'tracking' - if your performance drifts off-frequency like misadjusted VHS tracking, you face elimination. It is the checkpoint all players must pass through, recording entrance and exit from each league to create the permanent record that determines membership tier.