SidelineSwap can provide you the necessary shipping info to rectify the situation, but we cannot provide you additional shipping labels. You can create new shipping labels on USPS.com (Create label on USPS), through Canada Post, or whichever shipping carrier you prefer. Please go through SidelineSwap Support to send the shipping labels to the buyers.
The funds from the sale/s will not be released until the situation is rectified. The buyer/s will be refunded if the situation isn't rectified within a week of the buyer/s receiving the incorrect items.