I would keep giving and taking away things on a regular basis. Constantly reminding the dog on a weekly basis that you are allowed to touch and take anything you want.

I would also keep in mind that it's easy for you as the owner to give/take/swap things out, but I would be wary of letting others do this with your dog, especially children. In my house and with my dogs I always try to teach children general rules about dogs. For me that's leaving dogs alone and to give them space when they are eating (treats included). There are other rules, but we're just talking about treats.

Sure my dog does very well with the 3 kids that he sees on a weekly basis, but that doesnt mean he'll be okay with other kids of the same size, I just wont take that risk even if he's never shown reactivity to children. I also dont want the children in my life to think that all dogs act like my dog. I tell them that every dog needs space, that we cannot just run up and pet them (or run near them in general).