Mine just came today and you are right Jesse.
With .010 sheet styrene I just hit the back of the punches with a large X-acto handle end and they pop right out.
They do recommend that you use a plastic object to hit them though so I am going to come up with something else.
Here is the punch set and some pieces I punched out of the .010" styrene.
The one on the left is the largest size and the one on the right the smallest.
I did not punch out every size, just a few:
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon