Have him meet you at the bank. If he is planning on robbing you, he could kill two birds with one stone.
and what would that simple explanation be? Well, it could start with asking the would be buyer. Rather like going out to the stable and counting the horse's teeth instead of trying to establish the number by argument.
Call the respondent and tell him / her it's already been sold. That way, if the intentions were nefarious, you'll no longer be considered a worthy target. Your safety is not worth the contemplated gain.
Desperate drug addicts live hour-to-hour, and will do anything for their next fix . . . how much does that cost? . . . it depends, but it might be as little as $10. That tells me they wouldn't hesitate to injure someone badly over $170 worth of fungible goods. More importantly, this doesn't sound like a major plot to me . . . if the respondent convinces the seller to drive to their locale, it won't even be inconvenient for them.
He shouldn't . . . Sadly, in this economy, Craigslist is not nearly as safe for the exchange of fungible assets as eBay, CT, the LCS, coin shows, etc. Especially now that there has been recent publicity over Craigslist robberies . . . some of the wrongdoers need only to see that it has worked, and will use the same recipe.
They will try to send you a check for more than that, then tell you to cash it keep a large portion & send the rest to them. Then you will get caught with a bad check which you will have to repay the bank & their gone. I know because a friend did just what I said. Be very careful.
The simple answer to this is the person may not have even read the price on your ad correctly due to any number of reasons, such as due to dyslexia. Recently, I listed two TVs on Craigslist for free. My ad clearly states, "I have two 25" tube TVs available. They no longer function properly. They are good for parts and are free. Take one or take both." Today a woman called saying she was interested in the TVs if they are still available. To her delight, I said I have one left. I then repeated what's in my ad that it doesn't work properly. She had a moment of surprise about this and didn't realize the TV didn't work. If she had taken a few seconds to read the description she would have known this. It could be the same kind of thing with your prospective buyer wherein no dubious intent is intended.
If you are not setup to deal with the risk of running into the bad guys, don't do it. Don't walk into a situation that you can't control if it goes bad. Selling silver on Craigs is not something most folks should be doing.
I wouldn't waste my time with an offer like that because Craigslist is full of scammers. I'll bet you anything the guy gives you some hard luck story like he's in the armed forces and will have to send his brother in law over with a check. Don't go for that BS. You only asked for $215 and he offers you $250?! He's got something up his sleeve, nobody is that stupid!!
We've exchanged a couple emails since the original one. I'm going to try to feel it out, if it starts to seem really fishy I'll just let it go.
If we end up setting up a day and time to meet I'm going to tell him the only 2 places I'll meet are at a police station or a bank. If he's not ok with that then I'll just let it go. But I can't just immediately dismiss someone offering me $250 for $160/170 worth of silver. Like somebody said, maybe this guy just didn't read the ad thoroughly enough.