This doesn't help now, but for what it's worth in the future for OP or others, I notice that when some customers drop off in person they take a photo/video of what they're handing off as an extra layer of evidence (besides whatever passes as a receipt that may be provided).
For PSA, when dropping off at an in-person event they've had a camera set up at the table supposedly recording the collection of items. Though for higher value things it certainly seems prudent to me for the customer to take their own pics/video as well...
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