What appears in flashback is the body of Dr Strange hidden by Mordo while Strange is in his astral form. I think the character is the consciousness rather than the body so this might not apply.
The body is seen on pages 1-2, 3 (fb) then 6-7 and 9. It is stolen between 2:3 (when the astral form separates) and 2:6 (when the astral form finds out the body has disappeared), probably before 2:4.
DOCTOR STRANGE II/DR. STEPHEN VINCENT STRANGE/"STEPHEN SANDERS"
ST 120/2
ST 121/2 (1-2:3)
ST 121/2-FB
ST 121/2 (2:4-9)
FF 27
Strange Tales 121/2
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