I know on the Featherweight group that I belong to there is always discussions about this. Some people use Febreeze, some people use coffee grounds, some those silicone packets you can buy. When my DD bought a pair of shoes that stunk up the house with glue (on sale, no returns) we bought the Febreeze & I was totally amazed how well it worked for that problem. Hopefully you can get rid of it & enjoy your trunk. Did you also try baking soda?
Here is a link to the article I was talking about.
https://singer-featherweight.com/blo...herweight-case
Should work the same for a trunk, I think.