here is the output, it was done in the dockingstation.
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Users\jbouwmeester>wmic path win32_systemenclosure
AudibleAlarm  
BreachDescription  
CableManagementStrategy  
Caption           
ChassisTypes  
CreationClassName      
CurrentRequiredOrProduced  
Depth  
Description
     
HeatGeneration  
Height  
HotSwappable  
InstallDate  
LockPresent  
Manufacturer  
Model  
Name              
NumberOfPowerCords  
OtherIdentifyingInfo  
PartNumber
PoweredOn  
Removable  
Replaceable  
SecurityBreach  
SecurityStatus  
SerialNumber  
ServiceDescriptions  
ServicePhilosophy  
SKU  
SMBIOSAssetTag  
Status  
Tag
            
TypeDescriptions  
Version  
VisibleAlarm  
Weight  
Width
                                                          
System Enclosure  {9}
          
Win32_SystemEnclosure                                    
System Enclosure                                                     FALSE        
Dell Inc.
          
System Enclosure
                                                     
3               
here was they serialnumber                                                                    
System Enclosure 0
C:\Users\jbouwmeester>