Where is a passphrase stored when I request "Remember until I logout"?

When you (with Nautilus or Nemo) access a resource that requires a passphrase you are presented with a dialogue that gives you the choices to

• forget password immediately
• remember password until you logout
• remember forever

When you select "remember forever" the passphrase is stored in your login keyring, accessible with seahorse (also see How to make login keyring forget a password)

Now when I selected remember password until you logout I cannot find that entry in seahorse. Where is it stored?

_{Note: I am well aware of the possibility to simply logout/login but I still want to find the place where it is stored.}