I found the box that replaced the boxes I received when I purchased strikes for a former collector last year.
The Container Store has them. http://www.containerstore.com/shop

Here is a picture of some of the boxes that I tried.
The one that really worked was 11 5/8 x 7 1/8 x 3 1/8 h
Medium Latched Box - item # 10060201
Holds 5 rows of strikes - approx 100 per box.

I also got some of the colored inserts which will hold 5 rows of strikes as well, but there is no cover. You can stack them, or put them into a handled tote or a latched handle box like the smaller one. I like the colored boxes for my strikes that are for sale on eBay. The medium latched box works perfect for long term storage. Stackable, see-thru and labels stick well.