Matty Trap rebuild tips?

Ok, story time:

I live in the central NJ area and got hit pretty bad with Sandy two years ago. We’re talking four feet of water in the house bad. Unfortunately, my room was on the first floor. Lost all my books, gaming systems, you name it. One of the things that had hurt the most was losing my Matty Trap. Entirely submerged, battery door leakage, just destroyed. Same with my Matty PKE (I’ve since been able to pick up a new one of those).

Fast forward two years, I’m looking to rebuild the trap. I’ve been holding out for a good deal on eBay for an out of box one, but to no avail. So I turn to you guys. I have just a rudimentary knowledge of electronics (ie. Battery+wires+lightbulb=light), so The task seems daunting to take on on my own. I was smart enough to keep the trap, on the off chance that I could fix it down the road.