The very basic is to acknowledge they received the quilts. We all forget. I often tell myself that I will reply tomorrow and then get involved with other things. However, hand made quilts are another thing. There is considerable value and time. I was involved in a situation recently when we wanted an organization to be thanked for a donation and the receiptant said to send a stamped self addressed envelop and they would acknowledge the gift. Needless to say they won't get anything else. Suggestions to provide confirmation thru PO is a good one.