My understanding is that there is a trash bin where they can see deleted threads, but there's no indication of who deleted them. Still, unless it gets cleaned out often, they should be able to see the deleted threads, and we've given enough information about them -- NSA in the title, mention quantum computing and I2P -- that they should be able to find them and discover the OP, which is what Libertas wants. I could put up an SMF forum for us to play around with and find out exactly how that aspect works.