question on submission #`s

i`m going to submit a 2006 1/2 oz. plat, does anyone know the coin submission number or do i leave it blank on the form? thanks
my ebay items BST transactions/swaps/giveaways with: Tiny, raycyca,mrpaseo, Dollar2007,Whatafind, Boom, packers88, DBSTrader2, 19Lyds, Mar327, pontiacinf, ElmerFusterpuck.
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MS - 821118