I lost my phone but need to find it's IMEI. What places can I look? I had a Nexus S but lost it or it was stolen.
I need to find it's IMEI.
I don't have the box or documentation either.

I've checked exif data from photos taken with the phone.

What other potential sources are there for it's IMEI?
Got it!

Sing into your Google Dashboard.
Here scroll down to the section titled Android devices. You'll see a list of all devices associated with your account. Choose the one that you're looking for and click on the expander arrow. This will bring up a nice block of text that contains your IMEI and a last-seen time.