Removing a dead mouse from inside back of fridge?

At first I believed the stink came from the mouse hole in the brick wall. I sealed that airtight with expanding foam filler, also found a second gap in brickwork and filled that. I moved the fridge away from the wall and realised the stench is coming from the fridge not the wall. I can't see it in there and have used gloves to feel in all the gaps and nothing. There is however a moisture hole where condensed moisture drips out into a tray so it could have died in there. There is no trace of smell inside the fridge. I can't see it under the fridge. Any ideas? I put tape on the hole to see if the stench receedes. If the fridge was old I'd replace it but that isn't the case. How to fix this? Should I try to vacuum the body out from the moisture hole?