I bought my 505 off craigslist last year, for me I'd look at the general shape of the device. If you see a lot of wear or scratches on the eInk, it probably was abused and who knows what gremlins could be waiting for you. Mine was spotless, the gentleman I bought it from, and his wife obviously took very good care of it... Pay attention to areas like the connections, switches and the buttons. You can tell if it has been used with a heavy hand if you see the paint worn down/off in those areas.
-MJ
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