All the lists and cards have disappeared on my board

[Terianne]

I have a board that has completely disappeared. And yet it doesn't show under activity. 

I did manage to unachive a few lists. (not the most important ones) 

Someone else created the board. We are no longer in contact. 

[Michael Pryor]

If the person had access to the board and deleted the content then unfortunately it is gone (unless you are using a service like rewind.io)

You May be able to gather some old info from email notifications.  I’m sorry they did that to you. 

[Terianne]

The person said it wasn't her and i belive her. That's not her style.

Oddly I recovered some lists (i don't even know what i did to accomplish that) but the most important list is still missing.

I've never received Trello email notifications. Should I have gotten them? Perhaps they went elsewhere. But wouldn't they show up if i did a search in my gmail?

[Terianne]

I thought of something else. Could something have gone wrong when Trello changed from teams to workspaces, think it was 17 June? 

I encountered the issue only on one board -- the only board that is shared. (the other person created it.)

sorry to bother you but that darn list was mighty important.