1) no necessary. If you have canon, just pick one similar model under canon is OK. They don't care. Choose INK>ANY is the best since when you buy from flea, you don't know what is the model they will ship for you. 2)no copy needed. If you can, take a picture use you camera/iphone in case HP ask for it. Sometimes your printer has been used trade in before by someone else, you can use the picture to argue if that happens. You need put the S/N on your invoice with price circled to email to HP. If packing slip without price, HP will not accept. Online invoice is fine as long as it has price. Staples instore receipt is not good if you have already did the $50 instore trade in.
【在 r*******r 的大作中提到】 : 从没做过trade in,求解答 : HP trade in online 注册时要求 tradein 打印机的型号,寄回去是否要一致? : trade in 时要不要 SN 的copy.