I haven't had that specific thing happen, but about 10 years ago I bought a near-set of 1972 Topps excluding the high numbers on eBay. When I got it, the seller had accidentally included the high numbers as well, which were probably worth as much as the cards I had bought. I e-mailed him right away and sent back the high numbers in a separate box. The seller was very grateful and paid for my shipping costs.
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