My experience was very similar. Had to fill out a bunch of family tree info. I was the executor, and they wouldn't tell me anything, including the amount. Once they determined who the beneficiary was based on their criteria, they sent a letter to the beneficiary making them aware and asking for further documentation. I don't know that we found out an amount until the check came.
Was your wife the executor for her brother's estate?
Ooops! There is NO executor for her brothers estate.