You are right of course, it does not sound like a minnow bucket. It sounds like a part of a homemade "Minnow Trap". They are often made of clear plastic, and have holes at each end for the funnels, which are made of plastic or wire mesh, usually.
My apologies, believe it or not just before I posted this I was on a FISHING board, www.pierandsurf.com, and posting on a thread discussing minnow BUCKETS, I posted, and had them on my mind. :-) I have both a minnow trap, and a minnow bucket.
But, as I've pointed out ad nauseam, Minnow Traps HAVE SIDE HOLES AN INCH OR LESS WIDE. An infant would have trouble fitting their hands in one.
The problem with the whole minnow trap speculation business is that the people who invented that speculation got so incredibly proud of their own genius and cleverness they started posting a million pics of them to each other and are totally oblivious to the fact that even a genuinely retarded or brain-damaged FBI agent would note there's no physical way one could be used for a glove box.
And eventually oblivious to the fact that the minnow trap business actually has no connection to anyone who knows anything about the case or has seen what the FBI actually pulled from the pond.