Possible to display the box of the periodic boundary condition

Vice nice project!

Is it possible to display a periodic boundary box for a pdb file with box defined like this?
```
CRYST1 42.00 42.00 42.00 90.00 90.00 90.00 P 1 1
```
I tried the `miew.app`, but can't find a command to display the box.

I have an example pdb file here.
[mixture.pdb.zip](https://github.com/user-attachments/files/17177190/mixture.pdb.zip)