Gifts are only deductible when given to a registered tax exempt organization. You can look up the organization here.
https://www.irs.gov/charities-non-profits/tax-exempt-organization-search
[Edited to add] Donations are also deductible when given to a state or local branch of government, even if the government is not listed on the exempt organization web site. However, donations are not deductible if given to individual people or unregistered charities, even if they are needy.\
Then, you can list the donation as items, choose ""I will value myself", give a generic description like "used household items" and your value. However, if audited, you will need to show the IRS a detailed inventory that includes a description of the item (with enough detail to determine the fair market value), the approximate date you acquired the item, the approximate price you paid, the date of the donation, the fair market value of the used item, and how you determined the FMV (such as thrift store prices, eBay prices, etc.). The value claimed on the receipt is not necessarily good enough, you need to have your own valuation.
