Was it a one way or a two way (bi-directional) synch, I think every synch tool I've come across defaults to the latter. In which case Syncplicity would have deleted the folders on the desktop to match those on the laptop.
The metadata, as used by calibre, is held in the in the library root in the calibre database (metadata.db), the metadata.opf files in the book folders are there to facilitate restore of the database if it gets corrupted. Did you rebuild the database on the laptop?
I have to ask this - did you backup the library before you used Syncplicity on it?
BR
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