Part numbers on giant bricks?

I was in a supermarket (UK), and noticed part of a Lego display was loose (there are more like this, but all attached to the shelves). It looks like an upscaled 3010 yellow brick. I wanted to see if it was in fact just a giant brick, but unfortunately it is hollow. However, it is made of ABS which is the same as normal bricks, and has a part number - 87333. Does anyone know if there are other giant bricks out there? I can't find one listed by the part number on bricklink or rebrickable. ...