Help deciphering

Dear Liste members,

I have a number of addressed envelopes to Amerika with difficult-to-decipher
handwriting of the originator addresses. Sadly, there are no house
addresses, and the letters were destroyed because my grandmother did not
want them to survive because she could not read German and did not
understand their content. Luckily my Aunt, when carrying out her mother's
wishes, thought to save the envelopes.

Below are links on google.docs to four scans. Is anyone able to determine
what the meaning of eigener is in this usage, and what the other words such
as Abfc?, Ob/Abfimder? mean?

I am stumped.

Thank you for your assistance.
Suzanne Berger