So I took a little melted bacon grease and painted the outside of one of them, to see if that worked. It did, but it was slow, it’s taken about 7 weeks for him to demolish the bone. Once he realized there was flavoring inside (beef), it went quicker. So yesterday I decided to give him another bone from the bag and this is what it looks like already, no bacon grease needed.
This is Wookie's favorite place too, he has a bit of a foot/shoe fetish. He doesn't chew on them, he just likes to lay on them and lick them!
Now that he knows he likes the inside and chewing them apart, he loves them!