To be sure whether it's the HCl salt or not you could test the melting point of a small sample. MP of 5-Meo-DMT = 69-70C, MP of 5-Meo-DMT-HCl = 145-146C. A simple way to test would be to put some in a glass container, boil some water, and submerge, once equilibrium is reached if the freebase it will have melted easily, if it's the HCl, it will still be in crystalline form.