GST bill without GSTIN No. Can i upload the same in gstr2

I have purchase goods in july'17 but i have register gstin no. But party had not given the same in the bill becoz we have given gstin no. to him in next month i.e ; aug'17. He file the gstr 1 and gstr 3b by showing us as b2Cs.
We can add the same as missing invoice or not.
Kindly tell.