Suggest giving the donors a certificate that will bear the signatures of the Doctor, HR, and Unit Head. This should be done in the morning with proper notice provided in advance for collection near your HR Office. Simultaneously, display a circular thanking the donors for their noble act that saved the life of a specific person. This gesture will spread a message of belongingness, foster family bonding, and enhance concerns among all, showing that this was well managed. I can provide drafts of both documents free of charge to assist you.