Bright Air Odor Eliminator, will get the odor out. You can get it Dollar General. Put the jelly rolls in the bag as suggested open the container of Odor Eliminator, after pealing off the top sealer you can put the vent top back on or leave it off for for this project. In that small area it shouldn't take that long to eliminate the odor.
We loan out our Jeep several time last summer which was used to go to the river fishing, canoeing, etc. Then it sat unused for a few weeks. When I got in the car it smelled like something dead!
I put one container of Odor Eliminator in the floor between the seats, closed up the doors and windows and left it for a few days..........the smell went away. That was in Sept. and it still smells ok.
The size container I bought is supposed to be effective for 3 mos. I've had it in my house for all this time and it still is working.