Seller being difficult about returns

[yugiohcards4]

So I recently purchased some YuGiOh cards from someone on eBay (I predominantly buy and sell YuGiOh's so I kinda know what I'm looking at/looking for) and  today I recieved those cards and most of them (about 90%) are fake cards. I have opened a case with eBay and PayPal on the returns front but I am curious as to what will happen if they claim not everything was sent back? 

I bought approxiamately 2000 cards from this guy and he's been constantly accusing me of taking out cards (even before I've returned the item) even though I haven't and I was just wondering how it would affect the case if he throws in a formal accusation of this happening. Again I have left all the cards in the packaging that I recieved them in and will be returning them in that package but I just want some advice on this issue. 

I buy and sell so I know how tricky customers can be (never really met a difficult seller though)

Thanks!

[arkwebus]

"we have contacted eBay and got lots of advice "

Really?  The only advice you need is to go to the resolution centre and open the case for not as described.  Do not contact the seller, do not contaat eBay!  Do not - under any circumstances try to settle this outside eBay!

When you open the case the seller should send a label to return. If he does not [silly!] then after 9 days escalate the case to eBay and you will probably get a "no return refund"!

If he does but then claims you have not sent everything back that rarely goes anywhere.  If you are past day 9 then - if you can - escalate the case to eBay

We hear of people who send back items which they have simply replaced and sent the old one!  EBay is always said to find for the buyer!

[yugiohcards4]

This is the first time I’ve ever received something not as described - i haven’t escalated the case just simply spoke to someone at the help centre who provided advice on the process and when to contact them further. I have only contacted the seller to inform them that I would like a refund and ask them to do a returns label, fingers crossed it gets sorted in the next few days 🤞

[vijorey]

Have you opened a case?