You might try emailing this person who mentions that he has a photo of Lil Nemo.
This is a guest book entry from 1998, so who know's if the email address is still good?
Record # 57 http://www.453rd.com/guestbook/archive1.html
I am pretty sure that Lil' Nemo is a reference to the early comic strip "Little Nemo"dating back to the early 1900's. It is difiicult to see what he is dragging. It looks like as sack or a bomb?? He seems to be taking it to Berlin anyway.