People who spoke with him described him as having a thick/ heavy/ deep German accent, and he at least knew enough about Vienna to give an address that was a vacant lot.
There's no vacant lot, this must have been an error in translation along the way. The german forum linked on page 1 said the address he gave is "Ainstettersn 15, 4472 Wien" which is not a real address, it just sounds vaguely Austrian.
- Ainstettersn does not exist in Vienna, Austria or anywhere else (in fact, all search results link to this case)
- 4472 is not an existing Austrian postcode. If it was, the town would be located somewhere in Upper Austria, 200 to 300 km from Vienna. All Viennese Postcodes start with 1
People discussing the case in german language forums are thinking of a connection to "Amstetten", which is an actual town (not street) with a completely different postcode (3300).
End of facts. Begin free association:
I tried to imagine what similar spellings could be derived from "Ainstettersn".
1.)
"Ainstetten" gives results for a "Petrus von Ainstetten", a priest in Styria (Austrian sub state) who translated catholic scripture from latin/italian to german/austrian in the 15th century. Listed is the "Puch von menschlicher Aigenschafft" (Roughly: A book of human attributes) as translation for "De miseria humanae conditionis" by Pope Innozenz III. Not much more is known about this historic person. (All the search results link back to a Hungarian specialist in german studies who has written a book about him)
What if the deceased was a catholic priest/monk hiding the shame of suicide from his colleagues? VERY far fetched, I know. But here is Peter / Petrus, and Bergmann could be literally "man from the mountains", and there are lot of mountains in Styria.
Noteworthy: While "von Ainstetten" seems to be a place name (from Ainstetten), I could not find a place/village/county of this name, not even historic.
2.)
Ainstetter leads to a an author of unrelated books and some similar sleuthing about this very case on other websites. Removing the authors first name from the search, you get a bunch of butched scans of historic writing and a funny article about hunting Auerhühner in Tyrol, which is very probably not related in any way, but still a
funny read.
Then, I tried a different angle looking for missing persons in Austria, but there is no official list, and the websites listing missing persons don't go back to 2009 (or earlier).