Can't verify because my rural community only uses PO Boxes for mail and we have an automated phone
you neertheless have to specify your pysical address and to request the PIN to this address!
If you have been waiting more then 14 days for a postcard then your best option would be to contact business support
I recommend getting in touch with GMB support via one of these options and ask for help in getting verified:
Helmut Geissler, Google My Business Top Contributor | my G+ profile