I wouldn't count on the boxes of 100 being entirely safe just yet - I'm having the exact same problem over on another thread. (note to self - learn how to use search

Do you still know what the lot # was? Mine was either 2070565 or 2079565 (4th digit was smudged). Did you call Hornady about it? I called and they're sending me a new box and I sent my box back to them.
Good call on using the seater plug as a poor boys' comparator...I'm absolutely using that trick on the replacement box!
Thanks!
John