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So long as its not blacklisted, you can do a factory-reset which will deregister it. If it doesn't have a password lock, you can also deregister from the device.
Apart from blacklisting, and general condition, there's not much you can check. It's possible that the battery life will be lower than a new device, but you can't really test that, except to make sure that it does work from battery at least for a few minutes.
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