They have these nifty devices now called "computers." They're all the rage. They help automate laborious tasks.
SD
We were pretty much told when we registered that the envelopes were to keep track of Mass attendance -- esp. for those with children in the parish school -- to help facilitate tuition reductions for active members. They told us that we didn't have to put anything in them, cash-wise, at all, if we couldn't or didn't want to. Or we could include prayer requests and intentions.