I'm assuming you are referring to "where are they in my Team Hub"? Those aren't able to be moved over in the current workflow of Team Migration. Hence, they should still exist in your Personal "single user storage" , shown in the image below.

Click on that blue box to the right of your name (this is above the Data Panel btw) and it will bring you out to the A360 location of your old storage area. You can then download all your "Assets" as .zip files and import them back into your Team Hub "Assets" folder.
Or....are you saying that nothing exists anywhere?
Seth Madore
Customer Advocacy Manager - Manufacturing