Yup, this is in fact an Active SCSI terminator (there's a bunch of resistors on it), and if you look closely (take the PCB out of the case) you can see that it is actually meant to be a separate PCB, and is labelled somthing like C= SCSI terminator board rev 1. In fact, it looks a lot like the scsi terminator C= shipped with the A4091 SCSI controller.
It can be safely cut off (I've cut mine off) to enable usage of the port cutouts that are obstructed by it.
-Paul
