Hmm...pretty sure 3 rasboras can't completely devour another one overnight. Shrimp and snails can do it quickly, but other fish tend to pick at the carcass unless they are really hungry.
Scenarios 1-3 listed by lauralee are probably more likely. I think Petco has a 14 day return policy. I know Petsmart does so you have some time to locate the carcass if that's the case.
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