How will they be able to prove anything though? The seller could send an empty box. They'd have a tracking code then "proving" they'd sent the item. The buye

How will they be able to prove anything though? The seller could send an empty box. They'd have a tracking code then "proving" they'd sent the item. The buyer could claim it was an empty box but the 3rd party wouldn't be able to know if it was or not. A scammer would just have to ensure they cycle 3rd parties so their actions aren't noticed(or cycle accounts). What's to stop that?