An exchange is always a gamble. You may or may not like the blocks you receive. You may or may not consider the stitching adequate to your own standards. You may not even get a block back. I've had to replace one F8 of mine that went missing. I've had to resend a finished block to Canada that was sent to me by mistake. I would actually like my own fabric back since it was from my stash and I can't replace it anymore.
We've all spent lots of money to send the F8's, then the time to sew a block that our friends would like. Then the next expense to return it. So this hasn't been cheap, or even easy. We all started from the same rules, but now it's 3 months later and I think it's time to just get it finished. Rules are not optional - they are meant to be followed. So for those 4 blocks that I didn't receive back, I'm sorry that you didn't take this exchange seriously. I hate to say it, but I've learned a lesson - a not so fine of a lesson.