Buy some inexpensive strong coffee not instant in big cans maybe 2 or 3 spread it in the trunk. Keep it shut for a couple of days you might have to change it or add more and mix it around. Leave it in there longer.
I use to drive truck and that's what we used if we hauled meat like chicken, pork, that was in bins. So after we washed and the trailer dried if it had still smelled we put coffee all over the floor. It really works