Last week on the loon Cam I watched one of the parent Loons clean out the nest, after one of baby loons had hatched, the loon took the remnants of the shell and took off with it in it's beak to deposit it in the water. According to some sources, this is a way to discourage predators from being attracted to the nest.
Far Guy and I noticed the Bluebirds one afternoon, busily feeding their babies, one time they left a worm, but went into the box and came out with something in their beak and flew west..no doubt to get rid of the shell in the woods.
Recently several of our friends that died chose cremation. A much older than me lady said "I came to say goodbye, one last time, but they aren't here." She was distressed, so we talked, about burial choices, and shells and how it isn't important what we do with the shell, because it is only our soul inside the shell that counts. I think/hope she was comforted in some small way.
I had a conversation with my Father also, basically he told me it's doesn't much matter, in a box or in a urn, you don't need the shell anymore. When I told him of my wish to be cremated, he kind of winced, and shivered all at the same time and said "EWW." Well, I then told him I really wished I was a Viking Princess.. the body ceremonially dressed and plopped into a boat, set adrift at sunset with many warriors shooting flaming arrows at the boat, the flames lighting the night, the sparks flying heavenward, the boat totally sunk by morning. He just shook his head and laughed.
We have a friend in Idaho, her parents were duck hunters, when they both met an untimely death, their ashes were incorporated into a set of duck decoys that reside in their living room. I hear that your ashes can be sent into space or incorporated into a living reef in Hawaii.
Whatever your persuasion about your shell, in a container, in the garage is not a great idea:)
