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>