I bought an item 4 days ago still not dispatched?

I won an item on ebay and paid straight away. It's been 4 days now and I've had no communication from the seller and it hasn't been marked dispatched. It says they dispatch within 2 working days. I can't open a case until tomorrow as the delivery estimate is 7-8th December. Is it ok to contact the... show more I won an item on ebay and paid straight away. It's been 4 days now and I've had no communication from the seller and it hasn't been marked dispatched. It says they dispatch within 2 working days. I can't open a case until tomorrow as the delivery estimate is 7-8th December. Is it ok to contact the seller to ask whether this item has been shipped?
I usually wouldn't be bothered but I'm concerned as it hasn't been dispatched and it cost a lot of money.
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