No, you can't delete the offline locations...
There are only two ways...have both iLoks PC's available
to move between them, or do a "transfer". These
are the only ways to "move" licenses that I'm aware of...
Otherwise they stay in your account perpetually...
Why didn't iLok just "move" your license back to your
active iLok PC rather then "issue a new one"...
Also, ZDT (Zero Down Time) can help prevent these problems
a bit more easily...