Did I get scammed? (molcajete)
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I have no opinion on it being stone or concrete. But a past thread might be helpful to you figuring it out.
Yours looks real to me. Especially if your getting the sulphur smell. It takes a long time to get these seasoned well. The main thing is to get the grit out of the pores. Rice with a little water is common here. It just sands the surface lightly. The best thing we've found is to use a power washer to remove any grit. If you come across some dried corn kernels they are also helpful to rid a bit of that sulphur smell. If you use it regularly it might take a couple of months to really get it seasoned. considering it will last a lifetime and more if you pass it along, a few weeks are minuscule. Happy grinding!
Sorry for the blurry picture.