I would apply for a betreibungsauszug and enclose a copy of it in each application as well as a cover letter explaining why you might be the ideal tenant.
This document (
betreibungsauszug ) is obtainable on the spot from your Gemeinde (
if in Affoltern am Albis, it is here - credit checks register Tel 044 762 56 56 • info [at] affoltern-am-albis.ch ) for a small fee (
usually about CHF17/- ) and valid for up to 3 months (
required even if you were in the country for a few days ). Expect to reapply and pay again once 3 months are up if you were not successful in obtaining tenancy.
Trust this helps.