Mail - How to recover Archive Mail

I've tried to find the correct Community for this question ( Mail ) but can't find it, so using this one.

Hi out there, can anyone help please, I accidentally move my Archive Mail into the trash today ( about 3 hours ago ), but I did not empty the trash, now I have lost nearly all of my Archive Mail.

Does anyone know if it is possible to retrieve them.

Hope someone can help.

Regards

Steve ( UK )