GST Return Details

client have Seeds business which is nil rated i.e tax free. Sales occures only in 3 month throughout the year, while rest of year sales returns are made.
Query is, while filing GSTR 3b/ 1, should i net off sales return from sales or should i report gross sales figures in Returns.

netting of will result in negative figures in few months since no corresponding sales exist.

reporting gross figures will result in overstatement of turnover
what should i do ??? Help please !!