The rulings seem to point to the fact that the Mirage Token uses the current ATK/DEF values and doesn't mirror them. It takes into account ATK/DEF boosts due to equips before and after activation. My assumption would be that if it was just the original ATK of the monster, the equip card rulings wouldnt' be mentioned at all:
"¢ When the targeted monster's Level, Attribute, etc. are changed after "
Physical Double" resolves, the stats of the Mirage Token are not changed. When the targeted monster's Level, Attribute, etc., are changed before "
Physical Double" resolves, the changed stats are adopted by the Mirage Token.
"¢ If a Field Spell Card was active before resolution of "
Physical Double" that applied to the targeted monster, it applies to the original monster and to the Mirage Token. So if a Field Spell Card was increasing ATK by +500, the original would get +500 ATK and the Mirage Token would get an additional +500 ATK, for a +1000 ATK bonus total for the Mirage Token over the printed ATK of the original monster. Likewise, when "
A Legendary Ocean" is active, and you activate "
Physical Double" targeting a WATER monster, the Mirage Token's Level Stars are 2 fewer than the printed Level Stars of the original targeted monster.