Press the button underneath the wiper stalk until you get a little 1 in the top right hand corner of the bottom section of the DIS.
The manual describes things in more detail:
https://www.manuals.co.uk/audi/a3-2008/manual?p=38
Part number 25:
https://audi.7zap.com/en/rdw/audi+a3+s3+sportb+lim+qu/a3/2009-646/1/133-133042/
Googling the part number comes back with a N80 evap purge valve.
The part posted above slots over the boot door latch and the interior trim goes over it.
Number 15 is what you're after: Again looks to be one moulded part rather than just the springy flap.
https://audi.7zap.com/en/rdw/audi+a3+s3+sportb+lim+qu/a3/2005-412/8/863-863085/
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