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Mold can happen – however if you are using a normal refrigerator and not one of those small “dorm” frige , nor a wine cooler then as the meat drys the moisture is wicked off. BUT as I said mold can happen. Unless the meat was “tenderized” which is declared on the package such as from COSTCO, then the mold is merely on the surface and poses no threat! If it was mechanically “tenderized” then there is a chance the mold has gotten under the surface of the meat. In that case your nose will be your guide. Aged beef has a nutty or earthy smell while ruined meat will clearly have a rotted smell.
Now back to the surface mold issue. You most likely will be doing a trim of the finished meat and therefore cutting off the surface mold – so don’t worry about it!
If you can send me pictures I’ll take a look and perhaps I can post them for you. My email address is firstname.lastname@example.org