While we all like to think that people are trustworthy and act in good faith (and perhaps most people are), we seem to observe a never ending list of of stories of "scams" on OzB.
I don't know how many posts we've had of either buyers rescinding or fabricating payments (PayPal, bank transfer, etc.), or sellers sending out goods that are non-operational, vouchers already used, etc. Of course in each case the "scammer" always disappears or is simply dismissive of any contact.
Are there any "fail safe" ways to conduct private sales that are not simply "cash in person" to protect both buyer and seller?
If I am selling then the only other form of payment I'd accept apart from cash is if they do a bank transfer and I wait for it to clear into my account before I send the goods. I tell them this can take up to 3 business days, so if they're happy to take the risk then we're good to go. Otherwise tough luck.