Wiped out all PM conversations by mistake

WINNER!!
Thank you. It was right there in front of my face. Never noticed the TRASH folder under the Inbox before. Seems you have to confirm you want to rejoin each one to see what's in it, but they are still there.

Thanks to all. Looks like I averted a small disaster, large inconvenience.
I never noticed til recently either. Glad I could help. Have a great weekend.