Went through a situation with one of my leagues many years ago where the secretary kept making changes to how we were recording our payments on the weekly pay envelope.  I think that the main part of the record keeping on the pay envelope is the responsibility of the team captain or rep to record the names of the bowlers and the amount paid each week.  There is another smaller section for the secretary to keep a running total of the amount paid each week and for the season.

What was happening in our case was we would enter the total amount a bowler paid each week ($15 per week) so if someone paid in advance for two weeks, then we would enter $30 for that one week, then mark the date on the week he was pre-paying.  So to use today's date, enter $30 for 7/17 and then enter in the column for next week, 7/24, enter the date paid, 7/17.  That way we would know who paid for what week and how much.  The secretary was going in and erasing that date and putting in the $15 and changing the $30 to $15.  Sometimes if a bowler was absent the team captain would pay for that week so he would enter $30 for his payment, expecting to take the $15 out of the prize fund later but with the secretary changing it to $15 and putting in $15 for the absent bowler, we did not know who owed what. 

Finally had a talk with the secretary and told him that the main section of the envelope was the team captains' area and his was the smaller totals section where he could track how much the team was ahead or in arrears.  No problems after that.

I know they're not cooking the books, as everything is adding up right on our envelope, it's just that we wouldn't have known who owed what if I hadn't kept track of things. It's basically the exact same as what MI went through. I know there's going to be a talk next week, a couple guys have already said as much.