I had a plot at /plot home 3 which was a double plot, deleted. It had Minecon and Doctor Who con on it and It took me a very long time to make it so id love to have it back. Also my plot 5. It was deleted and it was me and Sonicdahedghogs fave doctor who stuff.
I did not delete any plots that had builds on them. However, it's possible that I forgot to reassign them back to you after I copied them. If you could visit all my plots and see if any of them are yours, let me know the plot ID and I'll reassign them back to you.
As he said, @c0wg0d was doing this in maintenance, so if he didn't put it back, he might have forgotten. (Just paraphrasing) Spoiler: Tip You could've also done this in the 'Bug Reports' section.