I agree that we should not start a paper chase. What about an automated e-mail sent out once payment arrives? As the sender's email address would not be on the cheque/money order, maybe there could be a request posted on the donations page asking people to include their email in the envelope with their cheque/money order?
Later, if it's been so long with no confirmation email from QFG HQ in the US, then the sender can make enquiries from his/her end. In the meantime, SOTT/QFG gets an idea of how much is going missing, how much is on the way, etc.