FWIW - I had my leaking coolant bottle replaced and in the small amount of drive time since then my trunk smells a lot better and seems to be cooler (this could be in my head, but I don't think so). I think the relatively small amount of coolant that was leaking out under the carpet was hot enough to raise the temp.
If you're one of the posters who thinks your trunk is really hot, lift up the right side of the carpet and flooring to see if you have some coolant on the trunk floor
.