Thought I'd post a follow up.
I opened another packet with the same bad results so I ordered another 100 blades. Had my first shave this morning and it was perfect. Everything I'd come to expect from these blades.
The 5 blade packets look exactly the same save for a string of numbers on one end that I'm pretty sure weren't on my older good blades either. Inside is a different story. The new blades are nicely wrapped in wax paper with the glue dots of wax holding it together. The bad blades are wrapped in paper and no glue dots. In some this paper is wrapped rather poorly. The new blades do have "Super Iridium" stenciled on the blades, the old ones don't.
Not sure if this was some QC mistake or what, but things seem fine now.