Cosy

I'm not familar with Aurofil, but some generic fixes:
IF the end is not wrapped into a notch, fold a piece of tape into a circle, sticky side out, press the tape against the errant roll, pull it away. It may take several tries in different places before the tape finds the end. Or removing the label on either end may reveal the end.
If the thread is hidden in a notch, run your finger nail along the edge of the rim of the spool, you can feel the notch when you can't see it.
You can also snip the thread in one place, then pull on each piece to find the end, although this does waste some thread, but if you can't find the end you can't use the thread anyway.