That is what a re-form is. Apple rebuilds them with new case and any new parts. Same warranty and all. You can't tell them from new.
In fact for "peace of mind" the refurb is better because it was tested in a local US service centers for a bet longer then the new units are tested in China.
Many times the refurbs come over spec'd. The the Mac had a RAM upgrade and was returned the RAM is left in. I saw that with a refurb'd Mini once.
I'd call then better than new.
My 27" (older gen) looked like new, cost less, has the same warranty and the savings let me max the memory (for less cost than the original base model!).