When you sold the wallet was it really $100 BTC/USD? Because looking at the wallet transactions it seems that the wallet was pretty active up until mid 2014 or so. In 2014 the price went up to $1000 and was declining but never reached $100.

Last time it was $100/day was probably mid 2013 or even earlier.

The weird thing is when the wallet loaded, why wasn't the -rescan enabled so the bitcoin core wallet would resync the entire wallet history (not blockchain) and make sure it has accurate balances.