In early November I purchased the Roll20 Humble Bundle, and I've made use of a few items from it in the months since. Tonight, I logged in to find all of it missing. All the compendium stuff is gone, anyway. Deep Magic, Tome of Beasts, etc. The $5.99 subscription credit for the one month of Plus Level that came with the bundle is still on my account, waiting for when I have re-new my subscription later this year, so I'm hopeful that means your system didn't delete all memory of my purchase and you'll be able to restore everything.