EXS 24 Logic Sampler Users Group

With Logic 7.2.1, I'm using some SampleCell instruments that were
originally imported into Logic 4.8 EXS24. Then, I moved that fully
working EXS24 folder over to my new Mac.

Many of them play perfectly, and I can watch as the samples quickly
load into the EXS24.

However, when I access some instruments from the menu, I get no error
msg, but no samples are loaded - and ".exs" is appended after the
instrument's name in the menu.

I'd think if it couldn't find the samples, it would ask me where to
find them?

How can I resolve this?