We brief HQ that a count window is coming, without naming the hour for each branch. On arrival we identify ourselves, ask for the custodian, and request that the float be counted in view of both parties.
IOUs and temporary borrowings from the float are logged separately from the physical cash. Treating them as cash on hand is a frequent source of later variance disputes.
Replenishment vouchers since the last count are examined the same day when possible. A float that reconciles on paper but was topped up with unsupported claims is only half a clean result.
Branch managers receive a signed count certificate before we leave. Surprises belong in the findings memo, not in an email sent weeks later without context.