I like the Idea about putting in "nothing". A good opportunity to take out your revenge, if you need it, in a fair way. And the revenge becomes more valuable over time too.
Are post-stamps still a good collectible nowadays? You could fit a hole bunch of them into it.
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Thank you for liking my idea.
Can you please upvote it ?
I think post-stamps could be great for this.
I would try something that transports a personal value, too.