Would an Imp be resistant to the bludgeoning damage from a Mace of Warning? [duplicate]

The Damage Resistances for a 5E Imp are:

Cold; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks that aren’t Silvered

Would this Imp be resistant to damage from a Mace of Warning?

  • You could argue "Yes" because any Weapon of Warning should be considered a magical weapon, and therefore the damage it deals is considered magical.
  • You could argue "No", with a liberal interpretation of the resistances, because the mace is not silvered.