I have already asked this question but I post once again as helpdesk people at ethereum are asking to post here:
After several years of waiting, I have decided to check how much ether I do have in my presale wallets. As I checked one of them with the address: 31680d74c182be56e3c122e37f3584ca480d528d
I am getting: No free outputs to spend.
The wallets were in a hidden location, encrypted. I haven't used them so far.
I would be thankful in case you can clarify this issue because then I would have lost my bitcoins which I used for this wallet.