I have all of my 2003 boots sealed and the dates aren't on the cover or the UPC codes for the 2003 shows. So if there were multiple shows in a city (say, Melbourne, Mexico City, etc. you can't tell which is which). But they all have distinct codes such as E2K****. Is there a list somewhere of which show had which code?

it's not complete, but this might help you a bit:

http://www.xs4all.nl/~groenf/cd_boot2003.html

you could also just play the first song of all the duplicate shows per city ones and cross reference with http://pearljamwiki.com/ to see which show is which. I'm almost 100% certain that they've never opened with the same song 2x in the same city consecutively.

Thanks. But the issue is these are sealed and I won't be opening them. I need to know which is which without opening or playing them

Looks like the sidebar rounds that out. Thanks!