Arizona Silhouette has lots of Boxelder burl colors, but not in Buckeye.
William Woodrite has Boxelder in black/gold, but not in Buckeye. Closest yet.
Woodturningz has Buckeye burl, but not dyed.
Laserlinez.com has four dyed Buckeye burl colors, but no stock, and not in black/gold.
Craft Supplies (woodturnerscatalog.com) has Buckeye Burl in six dyed colors, but not in black/gold (yellow).
The stabilized buckeye at William Wood-Write Ltd. (William Wood-Write) does look more black and gold than normal. I'm not sure if they are dyed. The premium blanks that are individually photographed are really nice.
Wade, you're correct! I just confirmed with the original source of my interest through email that his Boxelder blanks had been mis-labeled by the seller as Buckeye. Hah!
Bob, you are correct that Arizona Silhouette has the BOXELDER burl in gold/black.
Two other sources for Boxelder in gold/black are William Woodrite, and PSI.
Thanks for your collective input to help solve the mystery!