HP printer stealing ~4 days of warranty?

I installed new [color] print cartridges into my HP C6380 printer at 23:44 on April 13, 2010 (just a few minutes ago). The printer’s web status page shows the correct time down to the second. However, all three of the new print cartridges say that the “First Installation Date” is 2010-04-09. This is odd, as I ordered the cartridges from the HP store on the 9th and the cartridges just arrived at my house on the 12th. I find it very disconcerting that my printer is backdating my print cartridges’ install date by 4 days, since it seems that the warranty expiration date is based on the install date.

I’m waiting for HP to educate me as to why this happened.  I’m also looking forward to the next time I need to replace a cartridge (it takes five: Cyan, Magenta, Yellow, blacK and a separate photo black) in order to see if this happens again…  I like the printer, but I don’t like being lied to by technology.  Well, I dislike being lied to by anything, I guess – but especially technology. :)

This (new window) might be related.  Maybe…