Dear catymag,
I did download only one of them before I tried anything else but it said UNLOCKED. The problem is that I can't use a .unl file to unlock. The unlock for the unit MUST be embedded in the img file. I will try out the other one and see if this one works. I had a chat with a garmin dealer today, and he told me that they use a new tech on the new maps where the unlock have to be WITHIN the file in order to work on the Streetpilot 2720 internal rom...!
On the other hand the file I downloaded from the first page work perfectly on my Nuvi 550 in connection with the .unl file