I am currently cringing at the thought of whoever won that Sand Tarakava set not knowing the value of what they have, and dismantling it for parts.
Also, not a prize par say, but I remember back in the way old days of BZP, one of the first threads I ever posted on was someone who received the last orange Vahi through Lego Support when (I think) theirs became damaged or something. That mask was made from a different mold when they made the gold plastic version a few years later (Still have mine somewhere.)