1. Photocopies are not accepted as evidence by Indian courts.
2. However, the witnesses shown in the said agreement may depose in your favour and the said deposition will be very important for you.
3. There can not be any adverse possession now since you have already approached the Court and got the injunction order against his said occupation.
4. Actually you should have kept the original or certified copy of the original which you have not done.
5. Pursue the case filed by you for claiming your rightb on the 8 yrds of common passage.
5. You now deny having entered in to any agreement with him and having received any amount from him and file suit for his eviction from your said property.