Banshee not moving all imported files to music folder

When I imported my music library and had banshee copy it from the external drive to my music folder, Banshee missed about 200 songs.  Those songs are still in the banshee library, but their location is on the external hard drive.   Is there some way for banshee to "re-import" those 200 songs.  

I have tried playing them with the external plugged in (they play fine) but Banshee doesn't import them.

I have a fairly large music library (10,000+ songs) and am using Banshee 1.5.0 on Ubuntu 9.04 x64.  I had the same problem in banshee 1.4.