You can only claim ITC for invoices in your GSTR 2B +5% .
Since you have already claimed ITC as per your books ,now first you should identify the invoices for which you have claimed ITC but which are absent from your previous months GSTR2B .
Now from next month you have to claim this much less ITC so that there is zero difference in ITC available in GSTR2B and ITC claimed by you .
Alternatively, you contact the supplier who have not uploaded your invoices on portal and ask them upload the same in their GSTR1 ,if they upload then you just claim ITC from this month's purchase books(as you have already claimed ITC previously which supplier have uploaded now )