part order received

We ordered a multi gym and a stair ladder at the same time, and they were sent with the same courier. There should have been three parcels, but only 2 arrived but with completely different tracking numbers.The main frame of the multu gym arrived marked one of two, but the plate weights that had the same tracking number didn't. I've got both labels from the boxes, but unfortunately I opened an Item Not Received rather than one that doesn't match the description. The seller has since said that the third box would be delivered which it wasn't, and has now said that the courier told him that two boxes were delivered, and has since stopped communication, despite me having two separate tracking numbers as proof of delivery. What should I do now that I'm waiting for eBay to get involved?

 

Thanks in advance.

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They don't need to go to PayPal yet. You CAN open a not as described after closing an INR. Please stop giving out incorrect advice on this.