Vault only using 2 out of 4 drives

Unless I've lost the plot, these two drives ... their serial numbers do not appear as listed in one of the robots.
Therefore NBU will be unable to work out that they are robotic.

Drive Name              Drive006
Index                   6
SCSI coordinates        {5,0,28,0}
Type                    hcart
Status                  UP
SCSI Protection         SR (Global)
Shared Access           Yes
TLD(1) Definition DRIVE=1
Serial Number           C38D27D000

Drive Name              Drive009
Index                   9
SCSI coordinates        {5,0,31,0}
Type                    hcart
Status                  UP
SCSI Protection         SR (Global)
Shared Access           Yes
TLD(1) Definition DRIVE=4
Serial Number           C38D27D00C

So, for example, from the scan output on RCH, one of the robots looks like this, which I think is TLD(1).

Inquiry    : "QUANTUM Scalar i40-i80  172G"
Vendor ID  : "QUANTUM "
Product ID : "Scalar i40-i80  "
Product Rev: "172G"
Serial Number: "QUANTUMD1H0031B11_LLA"
Number of Drives : 4
Number of Slots  : 50
Number of Media Access Ports: 5
Drive 1 Serial Number      : "HU1340YK5B"
Drive 2 Serial Number      : "C38D27D004"
Drive 3 Serial Number      : "C38D27D008"
Drive 4 Serial Number      : "HU1310UY4M"

scan output is sent from the robot, so the robot is telling us it has x4 drives, but as you see, the serial numbers of the two drives I have listed are not there.

This is an issue on the library, the scan output is the result of a scsi command sent yto the library, ie. we ask, 'what drives do you have', and we seem to be getting back the wrong information.

The other possibility is that the robot info is correct, but the drives on the media server are reporting incorrect serial numbers, but I think this is less likely.