Im sorry to hear that the battery box became damaged.
Yes you can replace that box. They sell this part but Sentry safe does not sell it.
You can however find a similar one for this application from many sites, but Radio Shack carries these if you have one near you still.
But you can also find one here at this excellent surplus shop online. I use then all the time with great results.
Also when you have the battery box you need, you can re connect with me for advice on swapping these out. No additional cost ;-)
Please visit this site: http://www.digikey.com/product-search/en?keywords=battery%20holder&WT.srch=1
I would call them to get the correct one fastest;-)
In any case, I will stick with you until this is complete.
Please rate my service thus far.
Also it is the only way I am credited for my time and expertise with you.
Once you rate, I will be notified and will add your question to my priority list so you can reach me anytime until this problem is solved.
Then you can reach me by simply replying to this message anytime.
Thank you and have a great day!