So, I am riveting the front side fuselage skins. Start off by fitting the -03 one-legged nutplate near the bottom. Uh oh - should be 2 - can only find one. Then I spot that they were in the same bag as the #8 nutplates and are almost identical. You've guessed it - after much searching, found it riveted to one of the front seat brackets... 
Time to stop and have a beer.
Time to stop and have a beer.