I was given .1569 bitcoin as a gag gift years ago.  I happened to see it in the safe (piece of paper).  After much frustrating research I determine that Electrum is the wallet to use, then transfer it to coinbase and sell it.  I am not interested of care about crypto currency, so I was going to get rid of it.  $156 showed up in my Electrum......the other $1600 was stolen?  Is that possible?