We have an offline donation form setup in Donations Classic and we have noticed a few offline donations are showing in reports as unsettled.
If the transaction was made 3 business days ago, then it is still possible for the transaction to settle, but it could mean that we haven't received the settlement data (BB743647) yet. If that isn't the case for your transactions then it is because the offline credit card donation was recorded as a contribution instead of being processed. When you are recording the offline donation, notice the verbiage at the bottom of the page that says:
"Use the Record Contribution button if the credit card transaction has already been processed and you simply want to record that transaction in Convio. Use the Process Contribution button if you want to execute the credit card transaction now."