[Jesse16]

As others have said, that seal is simply the inner grease seal that gets pushed, tapped in right before you put the front hub back on. Its a separate part, is not included with the bearing. Our host sells and you can get at a local part store over here. $5 or $6 bucks as I remember. Your photo makes it look like the seal "fits" the bearing but in fact it only barely touches the outer race if at all after install.
I believe you tap it in flush with the hub or maybe there is a space in the hub to receive it, can't remember. It gets replaced usually anytime you replace the bearings, good to keep a few on the parts shelf.