It did have a warranty seal by the looks of it, it is quite visible in the picture stuck to the white rectangle on the label where the serial number would normally be instead of over the screw where it should beAs i told you on Reddit, please take pictures of the inside. I'm (and i'm sure many other people are) wondering if the motherboard will be different from retail or what other differences would be there.
Good thing is that Xbox One X doesn't have any warranty seals afaik. (at least that specimen doesn't)
in store display model will have all its port populated, blank board with fake ports
I very much doubt it's a form fit model - there would be no need for that FCC disclaimer if it wasn't functional. That also clearly implies it's a pre-certification unit, so the real question is if it's final spec or something earlier. On the Sony stuff you can tell really easily by checking the first digit of the assembly code on the board (0 = Development, 1 or more = Production release), but I'm not aware of anything equivalent for Microsoft hardware.