A couple things, 1 - our key FOBs will need to be recoded if you have tried locking/unlocking it with out power to the car (or out of range) for a considerable amount of times.  No idea how many presses it would take to reset the FOB, but I ended up doing it once on vacation and when I came back to LHR, well was a pain to get back in my GTi.  And 2 - if the previous owner de locked (I'm assuming shaved the locks) there will be a push button hidden to pop the doors open.  My old Eclipse had two locations, but they vary; I'd check, the wheel wells; under the drivers door; or search around for an easy-ish to reach to, but out of the way location to place a push button.  Anyone who shaves doors, has to put one of these in, just gotta try and find it.  Good luck mate!