Credit card receipts that have not been reconciled represent incomplete work (rather than reference material), so I put them in my tickler file system. I use hanging files for my tickler files and put manilla file folders in them as necessary. For instance, I have a manilla file folder labeled "Credit Card Receipts." I let it live in one of the last days of the month and can see the label on it sticking up from the hanging file folder.
Credit card slips go in the back of that manilla folder each day. When the statement comes, I pull that folder and take out of it all of the tickets that appear on that bill. I separate any tickets that are tax deductible from the rest. The tax deductible receipts go in a folder of documents to be used to figure next year's taxes. The other tickets are stapled to the credit card statement. The credit card statement is now reference material and is filed in the filing cabinet in a folder called "Visa," "Master Card," "Discover," etc.