How to find out the date of manufacture?

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http://forums.androidcentral.com – Hey guys, I'm new to these forums, so sorry if I'm asking an already-answered question or breaking any protocols. I did my due diligence by searching for the answer, both on Google and on these forums, but I couldn't find a satisfactory response. So... with recent changes in legislation on the legality of unlocking phones, I needed to see if my HTC One X+ was manufactured before or after January 26th, 2013. I have a problem, though. I do not have the box corresponding to my current One X+ because AT&T replaced my phone, but did not give me the box that goes with it. So, I have my old bo (HowTos)