Currently Being ModeratedMar 22, 2013 9:01 AM (in response to fuocozero)
I had an old backup
What kind of backup? Do you have a Time Machine Backup of your complete system from the time before the laptop was stolen?
To restore the Photo Stream images from that time you need to restore the folder
your home folder /Library/Application Support/iLifeAssetManagement/Assets
This folder contains the PhotoStream pictures that were part of the PhotoStream at that time.
To restore this folder from TimeMachine, open a Finder window showing this folder, make it the active window, and then enter TimeMachine. Go back in time in the TimeTunnel, till you see the correct date. Don't restore to the library but to a folder on the Desktop.