Device got stolen. How to see its activities using my computer?

I have 2 mobile devices using the same Gmail account. One of them got stolen. The thief has used my Gmail account and also search. How can I see the browsing history of the stolen mobile? I already searched in Google activity, and it shows activity for the device I still have. How to find the activity of the stolen device in my Google account? And how to trace the stolen mobile's IMEI and find out which person has it?