USBC clearly states that league finances are entrusted to the President and Treasurer of the league, not the house. The President and Treasurer are charged with auditing and signing off on the league finances monthly. They must both sign off on any expenditures such as "office supplies".
If you have a discrepancy you go straight to your president and demand an answer. If one is not given, the USBC should be notified.
As Vice President you have neither the responsibility nor the authority to go to the house questioning the league finances. The one exception would be if the President had failed to perform his duties and you replaced him. A second would be if the President assigned you as head of a committee to investigate the discrepancy.
From what I am reading you are volunteering to accept responsibilities that are not intended for your position as an officer. Including complaints from bowler's, all problems are the responsibility of the President. He is to handle them himself or appoint a Grievance Committee. As long as you allow other bowlers to bring complaints to you, and you accept responsibility of dealing with those complaints, you are circumventing the system set up by the USBC. At this point you become part of the problem, not the solution.
All officers receive a Handbook
, and a rulebook. All of the responsibilities, all of the actions, and means of resolution are spelled out in them. You should be directing your bowlers in accordance to the guidelines set out by the USBC.