Fake & Counterfeit Shirts from all over Unknown shirt type 2010 - 2012

2010 - 2012 Fake & Counterfeit Shirts from all over football shirt. I bought the Borussia Dortmund shirt on eBay. It is quite unusual and I am unable to pinpoint what type of shirt it is. The seller said it was a training shirt. The sponsors are faded, but you can see it is Evonik. As it has Lewandowski on the back, I have assumed it is the 2010-12 seasons when he played for them. The main colour is purple with yellow and black Adidas stripes with the Bundes Ligue badge on the arm. If anyone can tell me what type it shirt is, I would be interested in this information.