If you ordered them from a legitimate store (as in not ebay or something like that) than I wouldn't worry about that much.
And btw, this post is about 15 months old, don't expect a response from the OP.
Here's a link I found using the search feature on here that may be helpful to you.
http://www.focusst.org/forum/focus-st-maintenance/69481-replacing-oem-injectors-write-up-2.html