Failing that, you'll know the second you try to register it.
You should be able to tell if it had been wrecked by the title itself. Unless the guy wrecked it and did all repairs himself to a professional degree so that it was completely unnoticable. Unlikely.
MOst stolen bikes are immediately stripped for parts, it would generally be foolish to sell a stolen whole bike, so I wouldn't really worry. Unless the guy will only meet you in some dark alley to make the deal, promises to send you the title later, and gives you fake information, again unlikely. Just make sure the VIN on the title matches the VIN on the bike.