Returning to Stock Items that were not Paid (100% discount)

[bmlieber]

We operate a business that is required to pay excise taxes (not sales tax) monthly for products taken out of inventory and then opened for smaller than single unit sales/samples. The single unit sale has to be recorded to take it out of inventory and record it for excise tax payment, but we discount it 100 percent. On occasion, incorrect product removals have been recorded. These mistakes have to be returned to inventory and the sale "refunded". When the sale is viewed in our Square account, there is no option to issue a refund - I'm guessing because the payment method was "Record other payment". How do we return these items to stock and negate the sale so excise tax it not paid on them?