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Back of Check Images are Blank and not Endorsed
In general, a lack of endorsement (meaning nothing written by the receiver on the back of the check) is equivalent to it being endorsed "as deposit only" to a bank that the depositor has an account with. (See Uniform Commercial Code §4-205.) That is, the bank that receives a deposit without any endorsement promises to the banks that process the check along the line all the way back to your bank, that they properly deposited the money into the account of the entity that the check was made out to. With checks being processed with more and more automation, it's getting fairly common for there to be little writing needed on the check itself, as the digital copy gets submitted to the banking system for clearing. If you're concerned about there being some sort of fraud, that perhaps the entity that you're sending money to isn't the ones that should be getting it, or that they're not actually getting the money, or something like that, that's really an entirely different concern. I would expect that if you were saying that you paid something, and the payee said that you hadn't, that you would dispute the transaction with your bank. They should be able to follow the electronic trail to where the money went, but I suspect they only do so as part of an investigation (and possibly only in an investigation that involved law enforcement of some type). If you're just curious about what bank account number your deposit went into, then it just looks like you're the one trying to commit some sort of fraud (even if you're just being curious), and they don't have much incentive to try to help you out there.