If this was real Joan Jett merch, I’d buy it

Last night, at the “Clean Energy Jobs Now!” rally (review here), I kept scouring  the stage to look for The Blackhearts’ instruments. Every so often, I’d spot a black heart on something and take a picture of it. I was particularly drawn to this heart sitting on the corner of Thommy’s drum riser:

Cute little thing, isn't it?

Cute little thing, isn't it?

As musical acts left and removed their instruments, more of The Blackhearts’ setup was revealed. In this picture you can see that the heart appears to be on one side of a cube, with the JJBH logo on the adjacent side:

What IS this thing?

What IS this thing?

It was only after the crew finished the band’s setup that I could see this object clearly: it looks like an official, Joan Jett and the Blackhearts logo Kleenex box!!

I have allergies, so this would really come in handy.

I have allergies, so this would really come in handy.

OK, I know it’s not really a Kleenex box, but do any of you know what it might be?