Well, I don't think the actual amount spent for travel grants was
2957.28€, as IIRC, Nikos never claimed his 225.00€, so total expenses
would be 2838.28€, and so we should have
3630.74€ - 2838.28€ = 792,46€
left. On the bank account we have 887,46€, so either some reimbursements
still need to happen (but I'm not aware of any), or there is some error
in the calculations somewhere.
Let's keep it as donation from "unknown error".