Darned right you should try to get to the bottom of this. What you planned for those quilts and books and what you suspect might have happened to them is the difference between giving something away or having it stolen from you. (Example: If you gave something to a friend, you would both feel good about it ... but if the 'friend' stole it ... not so good!)
Do you still have the contact information from the woman who said she bought the quilts from RMH? She might be able to shed some light on the situation.