samsung galaxy s4 pressure
No , you don't need to worry at all. As mentioned if there are no scratches/ cracks on your device it proves how tough these devices are in reality. 

Here is an example which shows how much of actual force is required to damage any device. Taking the case of a pencil: 



Think about how tough your device is ? Galaxy S4 can handle pressure of more than 130 lbs whereas this pencil was just at 80 lbs.

So, no worries your device should be absolutely fine. In this case you also had extra protection with additional hardshell case to it.