For things like this, they're generally produced in (large) batches on a line, then once the run is finished the line is retooled for whatever is next on the schedule.
If nintendo use a third party manufacturer then I can't imagine there was much ceremony. If they own their production facilities then maybe they had a little mini-party? Most likely it'd depend on the particular teams working in the factory and what the culture is like.
Having said that, they may not even have known when the run was finished that it was going to be the last (management still pondering whether to do another run, or stock from the previous run lasted longer than expected so no new product produced) so it may well have been a total non-event.
If nintendo use a third party manufacturer then I can't imagine there was much ceremony. If they own their production facilities then maybe they had a little mini-party? Most likely it'd depend on the particular teams working in the factory and what the culture is like.
Having said that, they may not even have known when the run was finished that it was going to be the last (management still pondering whether to do another run, or stock from the previous run lasted longer than expected so no new product produced) so it may well have been a total non-event.