As jimbob101 said, if you know the copy on the second laptop is good then you can simply copy it and restore it after Dropbox does its thing.
But if not... well, the easiest and least-interactive thing in my opinion is to revert your entire Dropbox by a couple hours so the synced changes get undone.
Dropbox Support may be able to do this for you, but I used the following python script:
https://github.com/eli-schwartz/dropbox-restore
...
A series change only affects the database, and the backup metadata.opf files, so the actual changes will be minimal.
