one way.
I assume here you have a grouping on the the depositer/customer
add a Running Total
name=suppressCount
field to summarize=anything that is on every row
type=count
evaluate=for each record
reset=on group (your deposite/customer group)
suppress details with
{#suppressCount}>4
in the footer you can add a formula for you notification to the user of extra records (you can also use the actuall rT to give teh total count if you want)
if {#suppressCount}<5 then "" else "more records available at wherever"