If you know which wallet software use, maybe try to load wallet.dat file with them. You can't make any transaction without your encryption password, but I think you can see balance and then you will know it is worth effort.
I think it's bitcoin core... I used to run a local node, but not anymore.
I need something to see balance/public key without syncing, is there any tool for PC(Windows10) to analyze a wallet.dat file?