Okay so I realize it's a shot in the dark, but these are the best boots I've ever owned. I bought them used on eBay a few seasons ago. They're 2008 model
SLICKHOUSE BLOG13 BURTON : SEROW
Burton Serow Snowboard Boots 2008 | evo
NEW $280 RARE Burton Serow Mens Snowboard Boots! 7 *Limited Japan Release* GREEN 883249536161 | eBay