Not being able to actually getting hold of the packaging does crop on the forums regularly as an issue.
If you return the equipment via CollectPlus, keep hold of your receipt and tracking number very carefully. That is your proof you have sent the kit back.
If a VM tech collects your equipment, make a note of date/time it was collected and the tech's ID badge no. or vehicle reg. There have been past topics about equipment which has actually been returned taking a long time to be checked back in with VM, resulting in former customers getting return demands and warnings about being charged, even though the equipment had actually been sent back.