You only get 7 days to collect and after that the shop will dispose of it, either returning to the seller if there is a return address, using the same tracking number, or if not it will go to a central point where it will be disposed of to charity.
You should contact ebay asap and ask them for the code. The best way to contact them is here:
eBay Customer Service
They are open until 10pm and reopen at 9am tomorrow,
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