Lost progress upon creating an account
I have been playing the online Murdoku puzzles for the past few days (and looking to get the books upon completing what's online), but I didn't create an account at first and played as a guest. However, upon creating an account because I lost all previous progress (only the last solve, the last of the hard puzzles, survived because I still had the tab open with the solution and I could submit it immediately).
Is there any way to recover all the previous solves? I don't really feel like redoing puzzles just for the sake of completeness.