Bests & Worsts Reviews from Amazon

I've ordered many of these drives, a couple 256, 500 and 1TB. Today I received a 500GB for a raid1, I already had the 2nd 500 on hand from a couple months ago and when I put the two packages next to each other I noticed the old on says 5 year warranty and the new one said 3 years! I compared the SKUs, the model numbers and more and they are identical in every way except for the warranty. I read the document included in the box and that also confirms the 3 year warranty but when I look at retailers sites, Western Digital's website, their data sheets and warranty status checker, everything still says 5 years. Very confusing and concerning.