This looks like the film just came loose to me. My opinion: I wouldn't take any chances. At least call the seller and discuss it with them. Make sure that they will replace it if you find any issues when you install and test it. To test it, use the Processor test programs that Intel provides.
Hope this helps,
Thanks Scott. I did try to do that before I posted here but their customer service wasn't open. I sent an email with photos which went unanswered. However, this morning I was able to chat with them, and secured their promise that I could return it if something goes awry.