Just looking for some advice. My DD (14) has been selling some of her old toys on eBay. She has cleaned, photographed and listed them but each time she has chosen the recommended weight which auto calculates the postage. I have started packing the items for sale and quite a few are heavier than the postage we’ve paid for. I have searched evri and ebay but can’t find an answer telling me what to do! The first couple I just paid for a new shipping label but that means the tracking number and eBay protection the buyer has paid for are not valid. What will happen if I send with under declared weight? Will I have to pay the extra at the post office or be billed for the extra weight? Happy to pay the extra but don’t want parcel to be held up for the buyer. Thanks