Need help deleting old glacier vaults that aren't empty and I have no api keys

Without API keys or access credentials it is not possible to directly delete Glacier vaults or perform any actions on them. Glacier is designed to provide long-term storage for data, and the process of retrieving and deleting data requires specific authentication and authorization.

I would recommend opening a AWS support case if possible and seeing if there is anything that can be done to forcefully delete the vault without the keys available.