Harvesting Original Parts

[Mr70]

Have any of you encountered this?
With the prices of real 30+ year old Parts today,I would imagine this was inevitable.
You go to look at either a Full Frame off restored,or Unrestored Car for Sale,and upon it's inspection you like the Car & the details you see.You close the deal,and you & the seller agree to have the car in your garage weeks later.You had to fly in,so you can't take it home that very Day.
Weeks later,After delivery & full Payment,you notice somethings are not as they were,thanks to your notes.
Date coded door mirror is now a Taiwan repop,T-3 headlights,Taillamps,weatherstripping,Ex. tips & Center caps are too.
Spiral shocks are no longer date coded.
Engine components are also exchanged for overseas unauthentic items.It seems the seller has pulled a Bait and switch of sorts.Granted these are small finger items,but they add up,and they were indeed there when you looked the entire car over weeks earlier.I am seeing & hearing this more frequently,and was wondering if this is happening to any of you?