Wolf 5.45x39 750rd cases

Here are two cardboard box cases for the same thing - Wolf 5.45x39 55gr HP, one with the WPA branding, and one with “Wolf”. The boxes inside were all WPA printed for either one though, and were otherwise the same. I am wondering if the shown lot numbers of 3-16 and 4-16 are as simple as meaning March 2016, and April, 2016, and did this mark a time at which they decided to change over the box graphics? One odd thing was that the WPA box came with black duct tape over the “WPA” printed locations on either side of the box, as if they wanted to specifically cover that up for whatever reason - either the manufacturer or the importer? I used a heat gun to carefully remove the tape.