I would give them a bit more time to get back to you. If you look at the last feedback which was left on the 3rd April, that item was won the 22nd March.
The next one I can see the details of was left on the 1st April but won on the 5th March.
So the feedback doesn't prove he's currently shipping.
If you item was purchased on the 27th, they would only have had 4 working days to get it posted, and if he's like about half the people who I work with he may well have taken a holiday to take advantage of the 2 bank holidays.
Although frustrating hopefully you'll get your goods soon enough.