Practicing CA
7756 Points
Joined November 2011
In gstr 3B

GSTR 1 is for outward supply only hence you need not to show unregistered purhcase in GSTR 1.
But have to show in GSTR 2 which is not yet available.
P.S. RCM for unregistered purhcase is suspensed from 13/10/217 to 31/03/2018