I recently purchased a stock stereo with DVD navigation for my 2005 hummer.?

I was told by a dealer that I needed the VIN # of the stereos original vehicle. I can't get in touch with the person I bought it from, can I use any VIN # from a 2005 Hummer?I recently purchased a stock stereo with DVD navigation for my 2005 hummer.?not from any 2005 hummer because some of the dins (size of the stereo) are different because some probly didnt have the dvd player screen and all that....if u get the vin from a 2005 that originally had the dvd player in it, that'll be fineI recently purchased a stock stereo with DVD navigation for my 2005 hummer.?never heard of needing a vin number for a stereo.I recently purchased a stock stereo with DVD navigation for my 2005 hummer.?it might be for theft protection. if it is, you need the original