This Macintouch reference suggests FB is worth a look:
Use some file-system tool (SkyTag's FileBuddy for instance) to tell the MacOS that a certain folder is actually a Package. If File-Names were not ruined in the copying process, and multi-fork resource-files were not part of the deal (they are quite rare these days), then this trick will work for you.
The following FileBuddy screenshot contains an "info" window for file-system objects. Note the "Package" checkbox. That's the one you'll need to set up for the folders that "forgot" they were packages.