When I responded above I was thinking of the unclaimed staked SPS rewards, as they are recorded when awarded (chest, battle etc).

I hadn't been considering the impact of whether you claim staking rewards + vouchers (which come liquid the account), as those aren't recorded in a balance API until claimed 🤔

Though these aren't as a result as play as such, which was what I was thinking about. I don't think there's an easy way to track these until they are claimed.