Go to omegawatches.com and contact Omega with the serial number from the back of your watch - they should be able to tell you what model it is. If that matches what you've bought all should be good.
FWIW though, it looks to be good, although a cream/white warranty card (if it's original to the watch that is) would mean it's an early 2000s model as they swapped to the red cards (and new card storage) some 10 or so years ago ... give or take. It's quite common to have different boxes from new, the watches and boxes are not stored together, so mismatches are common enough.
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