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If you want to completely go off the deep end, I suppose you could take an old cover back to the house it was addressed to many years ago, and tell the homeowner that you must have gotten their mail by accident. Insert 'Twilight Zone' music here.
To truly make it "Twilight Zone"-like, dress in period costume and arrive in(on) period transportation. Not too much of an issue for a 1960's dated cover. 1860's? Well...