The spreadsheet that holds all of the rack information is located here. In order to edit this, you will need a google account that it can be shared with by one of the other administrators.
Get info about a machine
To get the service tag number from a machine, use the following command (you may need to do this as root, so "ssh root@...."):
ssh <machine>.aglt2.org '/opt/dell/srvadmin/bin/omreport system summary | grep "Chassis Service Tag"'
Use that service tag number here to get the purchase date and warranty information.