Hi apf1984,
Thanks for posting and welcome back to the community.
Usually our team would send a returns pack to make it easier for yourself to place the equipment in and return it.
However once they arrive, they will make note of the required boxes serial numbers and ensure it has been flagged as collected on any existing accounts.
I would also advise to make note as you said in case of any discrepancies for future reference.
Thanks,
Kain