Sign a message from the address you sold it from we can follow the address and verify if it ever had 5BTC.
You cannot sign LocalBitcoins addresses everybody knows that. Btw if that doesn't help you here is my trade
http://imgur.com/mh6b2sQ
So thank you for being curious about a trade that's already done ;-)
It's obvious you're just beating around the bush and avoiding providing any proof whatsoever.
Sign the Address of yours that ever had 5BTC and we'll be able to verify that it ever had that balance. The address you used to have the balance on.
YOU CANNOT SIGN LOCALBITCOINS ADDRESSES. Nobody's beating around any bush. At all. You're just finding something to nitpick about.