Tracking Cash Sales

Tracking and reports for online orders is working OK for what we need. But we need something better for cash & in-person orders.

For POS sales, we have less than 5 users with the Commerce APP; each with their own login.

At the end of the week we need to reconcile the cash transactions (how much cash does each person owe us?).

It seems the only way is by going to commerce>orders, pulling a report for the desired period, filtering by channel to get POS only, then cross referencing them with order notification emails, going over them to identify cash transactions, then figuring out which POS user is responsible for the transaction some how.

I suppose we can do unique discounts codes to increase tracking (i.e. USER1CASH or USER1CARD), but sheesh...

I've been searching for this answer for about a month. Figured it's time to ask the pros, but I fear I already know the answer.

Thanks!