XTS2500 is capable of multi-key. Here are all of the part #'s by model:
Part Number Description
PMLN4924A ASSY,PCB,MN,SECURE BRD M1.5 AES
PMLN4925A ASSY,PCB,MN,SECURE BRD M1.5 DES,DES-XL,DES-OFB
PMLN4926A ASSY,PCB,MN,SECURE BRD M1.5 ADP
PMLN4927A ASSY,PCB,MN,SECURE BRD M2 AES
PMLN4928A ASSY,PCB,MN,SECURE BRD M2 DES,DES-XL,DES-OFB
PMLN4929A ASSY,PCB,MN,SECURE BRD M2 ADP
PMLN4930A ASSY,PCB,MN,SECURE BRD M3 AES
PMLN4931A ASSY,PCB,MN,SECURE BRD M3 DES,DES-XL,DES-OFB
PMLN4932A ASSY,PCB,MN,SECURE BRD M3 ADP
DES-OFB factory installed options for both the XTS2500 and the XTL2500.
XTS2500
Q625 DES-OFB encryption
Q159 UCM Hardware Kit
H869 Multi Key
XTL2500
G625 DES-OFB
G159 UCM Hardware Kit
W969 Multi Key
There was also a sticky at the top..
http://batboard.batlabs.com/viewtopic.php?t=59946