If you have not received your blades and received a postcard from HF, check to be sure you weren't suppossed to send the card back as a confirmation you still want the blades.
I received the card on a Tuesday and when I opened the mailbox Wednesday to put the confirmation card in, the postman had already come and delivered my blades. Company said they would not send until tehy received confirmation I wanted them. Boy, am I good or what? :'