LocalBitcoins displaying wrong BTC balance

Describe the problem:
My LocalBitcoins wallet in Koinly is showing an incorrect Bitcoin balance. It should be zero (as its now a closed exchange) but it shows as a positive value. I have confirmed I do not have any BTC in that wallet. This only started appearing recently and i have not made any changes to that wallet, and there are no transactions which indicate more BTC were added

Which exchange/wallet is this regarding?
LocalBitcoins

How did you import data into this wallet?
Via CSV a long time back
(Note i no longer have the original transaction statements and on the LocalBitcoin site, the history doesn’t go back far enough to let me get my original transaction again)

What have you tried to fix this so far?
Reviewing transactions. Ultimately i need to set the balance to zero without it showing any trades that could have tax implications.

Hi @Riley

This means the files you previously imported were incomplete and did not cover your entire transaction history.

If you no longer have access to your full transaction history, you will need to manually add transactions to account for the missing data to ensure your balances are accurate.

How to add transactions manually