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Re: Wooden shipping trunk
This may help a bit.. I found two passenger immigration records for Katharina Knapp to New York on family search.org. This may offer a timeline.
One is 1881, the other is 1891.
https://familysearch.org/search/collection/results?count=20&query=%2Bgivenname%3AKatharina~%20%2Bsurname%3AKnapp~%20%2Bother_place%3A%22New%20York%22~%20%2Bgender%3AF&collection_id=1849782