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I have just completed 10234 Sydney Opera House, with one white half-shell (Bricklink: 41749 White Wedge 8x3x2 Open Right) missing.

Both the Bricklink inventory and the Lego instructions show 34 of 41749 and 35 of 41750, so this looks unusual.

Have I misplaced an element, or is this a known quality control issue with this set?

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There should be information on what to do in case of missing pieces at the end of the booklet –  Stephane Delcroix Dec 26 '13 at 6:49
I can't speak to quality control on this specific set, but if you ever find your set is missing pieces, you can easily get them replaced free of charge at service.lego.com/en-us/replacementparts#BasicInfo –  Peter Cassetta Dec 27 '13 at 3:09
Rather similar to the other questions on missing parts... –  Zhaph - Ben Duguid Dec 27 '13 at 10:43
In six years of collecting vigorously I've had missing parts, wrong parts, miscolored parts, broken parts. As your collection is growing, you will inevitably bump into these issues. Not a biggie. TLG's support is spectacular, and there's an easy-to-use form on their website just for such cases. –  RegDwight Dec 28 '13 at 1:02
Yes after years of collecting I have seen a few extra/missing parts. The same opera house also needed a few plates and a telescope that I had to take from my existing stock. I was wondering about the 35 left-sided/34 right-sided pieces on what should be a symmetrical build. I will read through the instructions again to see if my mirrored-building technique with opposite sides has confused me. –  Windfire Dec 30 '13 at 21:32

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