I've created a model box texture for Envelope X.

Copy another model box, IE the brute. Clear the contents of the box. Right click -> Custom, set the diffuse texture to
And the diffuse texture to:
https://www.dropbox.com/s/angwsal9ngkn4zf/BSBOX.jpg?dl=1

Copy the objects from the original bladeswarm bag, reset the bladeswarm character box, and then drag the new model box in.

Update: Now redundant in latest update