I looked, it doesn't seem to be there OOB For a MDS you want to poll this table .1.3.6.1.2.1.47.1.1.1 (.entPhysicalTable) Look for the "Fabric Stack Root" item And you serial number will be in the entPhysicalSerialNum (.1.3.6.1.2.1.47.1.1.1.1.11)  In any case your serial number is in that table.
I'm attempting to put together an inventory report for all MDS switches and have been able to populate all required fields but serial number. I've tried multiple properties but none seem to return the correct value (if one at all). The one I'm looking for specifically is the SN for the chassis. Any help would be greatly appreciated.
Property for CISCO MDS Switch Serial Number