For FI 282:
Quote:
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By VE-day, only three of the twenty-four prototypes completed by Flettner at Johannisthal still survived, the others having been destroyed to prevent capture. Two of these, the V15 and V23, were taken to the United States, and the other to the Soviet Union.
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Flettner Fl 282
Further on, on Wiki could be found these 2 pictures:

and

With USAF as source.
Further on, searching after FE 4614 I found on
Freeman Army Air Field
Click on "Freeman Army Air Field" expanding button on the left side.
Click on "German Aircraft@Freeman"
Scroll down until you'll reach the following buttons:
FE-4613 FI 282 V23 Copter
FE-4614 FI 282 Helicopter
Click on each button.
Happy reading.
Now I hope that you'll understand why FI-282 couldn't be find in any museum (anyway I seriously doubt that the sole FI-282 taken by the Soviets still exists).