Did you change the Primary fluid at the same time and drain into the same pan? If so, it is probably wear off the primary chain tensioner shoe. I had the same thing in my fluid but it came out of the primary, not the tranny. When I looked at what appeared to be brass with a magnifying glass, I saw that it would break apart when squeezed. It was the hard plastic on the primary tensioner shoe and it looks like brass.
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2013 FLTRU, Jackpot 2/1/2 Stainless Ceramic Coated Head Pipes, Fuelmoto Stage 1 Intake, Power Vision, Jackpot Full Size Ceramic Crossover, MADSTAD 16" Windshield, Motolight Running Lights, Nostalgic Rails, Airhawk R, Hayden Primary Tensioner, V&H Roland Sands Slant Slip-Ons