Hard to say, but I would either return it for full refund so as not to have to wait for shipment of the new one or suck it up and keep it. I don’t have any experience with using 8 speed crank in a 10 speed set up. You can probably find a used Shimano LX, Tiagra or some such lower end triple crank used for about the same cost.
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '82 Colnago Super, '95 Gios Compact Pro, '95 Carrera Zeus, '84 Basso Gap, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, '84 Paletti Super Prestige, Heron Randonneur