Some of the collectors here I hope can weigh in for you but I imagine number of heads is really important to know as well as maybe getting some pics of the skeleton. Also at least one image under white lights. The blues can be really deceiving.
If it is legit, dude should have a lineage back to the original source. If not, then pass and do not pay that much for it. You can either show or hide anything in a photo, so the lineage is what matters.
I know its been a bit since this post I'm no expert but I have a 24k holy grail and a asd green tip holy grail and I've seen the og holy grail the 24k has bright green bright yellow and purple blue tip the asd green tip has darker green orange yellow and green tip the og has the same type of green the same orange yellow as the green tip asd except the tip is purple blue also depending on light and flow nutrients colors can vary in intensity
I will ask to see corals under whites. Most knowledgeable LFS owners will know why your asking, and will be more then happy to oblige. If an LFS is trying to be shady, they will not oblige, and I walk away. I have been in nearly every reef shop(least what my google shui can find) in the NY, CT, VT, MA, PA area, and have only been turned down a handful of times.