Would agree, probably main seal or the plate the main seal presses in to. Does look a bit more like ATF to me too though. I don't "think" your torque converter has a drain plug, but if you want to double-check, possibly that plug might be dribbling a little and slinging the fluid around inside the bell housing, that would explain why you can't find where it's coming from. Bottom line is that if the car doesn't "leave it's mark" on the floor or driveway overnight, probably not worth pursuing IMHO.
Gilly
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