Hu miah! You can bring it in at any time without the receipt and they can heatstamp it for you for free. HOWEVER, I warn you as the SA may also say the same, it is a risk to heatstamp it if it isn't brand new. When the surface is brand new it allows the letters to adhere better and goes on neatly. On canvas/leather that is not new, it might not adhere as well and the color can bleed. Make sure you talk to them about that ahead of time in case they don't say anything to you because if it doesn't come out perfectly you probably be stuck with it. Maybe consider getting the heatstamp with no color so you don't have to worry about the color bleeding. Good luck, keep me updated please.