Audi A3 E Tron VIN Number Locations
Produced from 2015.
The Audi A3 Sportback e-tron, the first in the e-tron range
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Audi A 3E Tron not examined but the VIN numbers are likely to be that of a standard A3 as below

A3 VIN Number
Chassis/VIN Plate
Audi A3 E Tron VIN Plate is a sticker on one of the door sills or door jam
On the regualr A3 its on the offside suspension housing. The number displays no security marks.  A secondary silver sticker can sometimes be found in the boot compartment on the inside of the offside wing, quite low down. The ninth character is smaller than the rest and separates the number.

A3 VIN Number
Visible VIN
On the nearside of the front windscreen in bold black lettering on an Audi security light background. It is viewed through the obscuration line

A3 Chassis Number
Stamped Number
On Regualr A3 its on the centre top of the bulkhead but could be one either side or even the suspension housing
An 8 point star security mark may appear at the beginning and end of the number. It is usually viewed through a plastic covering
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Audi A3 E Tron VIN