The biggest issue with cash if its a week-end pick up, is the buyer (and any mates he tells) knows you have X amount of cash on the premises. Lots of dodgy bastards that would be happy to return and burgle ya.
Not sure if insurance covers a largish amount of cash held in a home?
We've just sold the caravan ($22,000) and Jeep ($6,000) and neither left until funds were in our account.
There was a case years back where some bank cheques were stolen and a guy in Brisbane lost a bobcat and tip truck out of it.
Well, that's what the story was...... true or not, i have no idea. I just don't trust them like I would've once, a long long time ago.