As scheduled, all the items on the attached list were handed over to the client on [date].
As scheduled, on [date], we handed over all the items on the attached list to the client.
As scheduled, we delivered to the client on [date] all the items as described in the attached list.
I prefer #1.
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"Hand over" and "deliver" are two different concepts.
We deliver things like batteries, chairs, apples, or blue jeans.
We hand over things like project management, maintenance of a website, and other responsibilities.