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those look to be the bearings from the case alright. dang that guy who sold it to you, assuming he also rebuilt the trans, is pure ridiculous. I wouldn't trust anything he told you. check every bearing in there for looseness including them spinning inside the bores where they fit into the case. they need to be staked 6-10 times so they don't wear out the bore in the case. I have a video showing the staking in my how-to: 2002 odyssey rebuild thread under the transmission section of this forum. if those synchronizer rings are worn just replace them, I would personally at least. and yes those are the rollers for the bearing, he probably didn't clean out the magnetic "catch filter" of whatever they call those.