- Do you have multiple wallet on localbitcoins.com or blockchain.info?  Answer: No. Just one Local Bitcoing Exchange account - I'm not sure what it's address is. The missing payment was sent to an Electrum address.
- Is the wallet in question an old or new one? Answer: The Electrum wallet in question was set up in 2014 and has been only sporadically used. The Recieving address is constantly refreshed in Electrum though.

- Are you sure, you actually log-in to copy this address when you sent the wallet address to the buyer or you just copied already saved address from your computer?Answer:  Yes, I double checked. I could not have copied another address and I compared before I posted. (See screenshot).

- Finally, do you normally access your coin both on mobile & computer (notebook/desktop...)? Answer: Only on Desktop - I don't have a mobile Wallet.

Thank you for sharing your story, SoldiersWithLittleFaith!