Below is a possible build for this power. Note that the total modifiers on the Warp exceed -80%, so it's capped at -80% despite that. Feel free to remove limitations to lose less functionality if desired.
"Spooky" Pickpocket At a Distance
Affliction 1 (Per vs Pickpocket; Based on Per for target, +20%; Based on Per for you, +20%; Warp*, +200%) [34]
*Warp (Accessibility, Only if unobserved, -20%; Accessibility, Only places you could walk/climb to, given time, -20%; Exoteleport, -50%; No Strain, +25%; Range Limit, -50%) [20]
Exoteleport is from Psionic Powers, p. 18. Both Accessibility limitation values are from Horror, p. 20. No Strain is from Powers, p. 89. Name of the ability is me having a laugh making an Einstein anti-quantum-mechanics reference. :-)
Notes: You can't steal anything you couldn't have realistically walked or climbed towards or that is being observed. You are limited to teleporting objects up to your Basic Lift. Repeated attempts are possible without penalty. You roll Pickpocket, target rolls Per.
P.S. If there is a better, more official way to write up embedded modified advantages in an Affliction, I don't know it, and this seemed like a clean way to do it.