If you clear 400 bucks consider yourself lucky! Craigslist would be your best place to sell them!
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Generally speaking, unless the damage is severe, they only rattle at certain freqs and power levels(iow: once in a while). Best way to test, is very slowly, with a sweep generator, at a decent amplitude. Of course, the original owner(s), may have kept them out of the sun, in a controlled environment and they're fine. Here's hoping!