eBay do ask for receipts if some high value items were sold .  Was it for the phone?  You sold it twice.  Did you have 2 , that may raise cause to ask for receipts,  or did you have a non payer?

Those are the rules I'm afraid,  if no receipt can be provided for when asked,  eBay can hold your payout for it,  for longer.

@srjgroundworks_3