Ut1 sez area

Sir / Madam,

We have despatched the material to the SEZ area without payment of duty under UT1. We have submitted original and duplicate copies of ARE1 along with a bill to the client and submitted 3rd and 4th copy to excise department.

Excise Department returned back the pink copy 3rd one (signed and sealed) to us.

My question is for the proof of export which documents to be produced to bond sanctioning authority? 

only the pink one which is given by the range or any other.