The store owner is probably by contract authorized to sign for and accept packages by the box owner, which satisfies the signature requirement for the postal service and other delivery companies. I think it will be very uphill to claim the store owner's negligence in not obtaining an internal signature is somehow the proximate cause of the fact that a fraudster was able to take advantage of some loophole in ebay/paypal practices and procedures. Perhaps a more plaintiff-oriented lawyer would have a different view.
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