How would you transfer the btc to your bank account without making the Banks / OECD / ask questions?
And even if you get cash from localbitcoins someday the efforoties may ask you from where this car or how you bought this house..
What would you do ?
There`s no way you can trade 500 BTC with localbitcoins in one single transaction.
Why are you asking this?Do you have that problem?
Big transactions are always suspicious for banks and authorities...