What should I do with money found in the house whose owner is unknown, with the fear that it might be from collected donations? Should I take it for myself, spend it on the house, or put it towards donations?

The money found in the house most likely belongs to one of its residents, so they should be asked about it. Whoever identifies it, it is theirs. Otherwise, it should be announced for a year in places where its owner is likely to be found. If the owner is not found, one may benefit from it after the year or give it as charity on their behalf. If the owner appears later, they have the choice to approve the charity or claim the money. It is not permissible to dispose of it before announcing it, especially since it was found in a private place where its owner can be easily identified. Furthermore, it is not permissible to accuse anyone of taking it based on suspicion without evidence.