How to get AucTeX not to mess up the contents of the boxedverbatim environment?

[Adam Funk]

I've just started using the boxedverbatim environment of the moreverb
package (LaTeX Companion, Section 3.3.3).  AucTex recognizes the
verbatim environment and doesn't indent or change the line breaks
within it (for example when putting a center environment around it with
C-c C-e).

How can I set it to treat boxedverbatim the same way?

Thanks,
Adam