I went into our local one years ago, and amongst all the cr*p instruments was a Taylor guitar for £500. It looked great, so I nipped home to check that model online and it was worth about £1800 new! I shot back down but it was gone
To be honest, any decent kit in there and I tend to think that it must be stolen, otherwise why wouldn't the owner take it to a decent shop? Having said that, there could be other scenarios ....