Issue with losing notes in free version

Hi, at my company we are using the free version of Asana for project tracking.

I am having an issue where I am losing the tasks and notes under a project. I was instructed to create a team called “Archived” and move completed projects there, but may need to refer to them again in the future. But it seems once I drag and drop the project into the other team, all tasks and notes are lost.

Is it possible to get these back?