Board Thread:Support Requests - Community Management/@comment-32025577-20181217181043/@comment-9605025-20181217193856

Depending on the size and activity, it was probably "cleaned up". Do you happen to remember the URL for the site? You can check to see if a dump is available. This would at least let you get a copy of all the pages (files not included unfortunately). Either way, if you want to know why, request that it be restored, or have any other questions, it would be best to contact staff using Special:Contact/general.