AnnetteB
Intuit Alumni

Deductions & credits

Even though the consignment shop did not purchase the items, they may donate them and claim a deduction if they are the owner of the items at the time they are donated. 

The donation amount would be based on the fair market value of the items at the time of the donation, not on the price paid to purchase the items.  This is true no matter who is donating items to charity.  If you as an individual received a gift that you decided to donate to charity, you would not have purchased the item.  You would value your donation based on the fair market value of the item.