This tan hinge piece was included in 40433 and is even called out in the set inventory at the back of the instructions, but I cannot find any step where it is
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LEGO 10pcs NEW Grey 4x6 Plate Bulk Lot 3032 4211404 | eBay
Flix-Brix.de - LEGO® Ersatzteile, Einzelsteine, Minifiguren und Sets (FlixBrix)
LEGO Medium Stone Grey Plate 4x6 4211404 3032 (single,N)