Diamond has the book back on this week's list.
I wonder if that was the same accident that happened at the beginning of the month? Marvel reported a distribution truck that got into an accident but no word on the driver(s).
If custom's gets involved, it could mean where the book was printed. I checked one of my IDW book's and it was printed in Korea. I've seen other books from Dark Horse, Image, Marvel, etc list the book was printed in Canada, China, so forth. It usually tends to come down to paper/printing costs.