Why not just leave them where they are and put your new decals over the old ones. Or create a "decoupage" look by putting decals or pictures all over the outer surface. Seal with a good sealany that will help reduce sun fading and water damage. Good luck!
A product like Goo Gone will remove the labels but I would try using a hair drier to loosen the glue to peel them off first ... or for that matter try a wallpaper stripper. But test it on the wood first to make sure it won't damage the finish.
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