Posting a credit for miscellaneous returned items?

Hello,

A credit memo was issued to us from our supplier for miscellaneous or obsolete items that we were able to return. I need to post the credit memo and remove the returned items from our inventory listing. The items likely would have a receiving slip, but I am unsure when they were purchased and they would have been received at different times anyway. I am unsure what the best way to post this would be. Any ideas? Any help is appreciated.

Thank you.