Hi Ken,
Here is information on your town. Credits go to Karen Rosneck
1. There is a Czałczyn , but I don't think this is a Rusyn/Lemko village (see sites below)
https://www.lopuszno.pl/samorzad/solectwa/czalczyn (official village site at the district's page)
https://en.wikipedia.org/wiki/Czałczyn (Wikipedia entry about the village in English)
2. There also is a Czaszyn which may be what he means, formerly in Sanok County, now Krosno County, that is a Lemko/Rusyn village:
https://en.wikipedia.org/wiki/Czaszyn (Wikipedia entry in English on the village)
http://www.czaszyn.pl/ (official website for the village, many nice photos)
[Use Google Translate [ translate.google.com ], copying and pasting portions into the search boxes (after setting the desired languages in the drop-down boxes to English and Polish, to get a rough translation if he knows little or no Polish].
3. For more on tracing Lemko Rusyn roots in Poland:
Try, for example: https://lemko-ool.com/?p=2187&lang=en (nice selection of resources by The Organization for Defense of Lemkivshchyna (NY) (they publish a magazine called _Lemkivshchyna_ (in Ukrainian and some English) about Lemkos (many living presently in Ukraine after the forced resettlement there by Poles known as Operation Operation Vistula [Polish: Akcja Wisła] in 1947).
See also the the parish records scanned and available online for various parishes at: https://geneteka.genealodzy.pl/index.php?op=gt&lang=&w=09pk&rid=5338 (Polskie Towarzystwo Genealogiczne [Polish Genealogical Society]) This may be another way to identify and verify the village name if necessary. Many Polish archives also have scanned parish registers and other documents available online to be accessed at their websites more directly if preferred.
See also: http://www.carpatho-rusyn.org/villages.htm (Lemko/Rusyn village finder)
4. Czaszyn arrivals in New York 1903-1905 at the Ellis Island database (searched through Steve Morse's interface):
1 Bodnar, Justyna Czaszyn 23 1879-1880 1903 view view view
2 Fal, Ilko Czaszyn, 31 1872-1873 1904 view view view
3 Hyrcza, Ewa Czaszyn 19 1883-1884 1903 view view view
4 Hyszczyazyn, Diomyzy Czaszyn 37 1865-1866 1903 view view view
5 Jan, Madry Czaszyn 25 1879-1880 1905 view view view
6 Jankowska, Anna Czaszyn 22 1880-1881 1903 view view view
7 Jankowska, Anna Czaszyn 17 1885-1886 1903 view view view
8 Jankowski, Antoin Czaszyn 16 1886-1887 1903 view view view
9 Jankowski, Jan Czaszyn 38 1866-1867 1905 view view view
10 Jovanisko, Osenfer Czaszyn 40 1862-1863 1903 view view view
11 Jozef, Osifkowski Czaszyn 29 1875-1876 1905 view view view
12 Kapuscinska, Kata Czaszyn 18 1886-1887 1905 view view view
13 Knatyszyn, Jurko Czaszyn 36 1866-1867 1903 view view view
14 Kudlik, Maria Czaszyn 17 1885-1886 1903 view view view
15 Lukowski, Antoni Czaszyn 26 1876-1877 1903 view view view
16 Lukowski, Franz Czaszyn 24 1879-1880 1904 view view view
17 Lukowski, Jan Czaszyn 15 1887-1888 1903 view view view
18 Matensz, Fiolek Czaszyn 32 1872-1873 1905 view view view
19 Miszczyszyn, Akim Czaszyn 18 1884-1885 1903 view view view
20 Miszczyszyn, Jozsef Czaszyn 35 1869-1870 1905 view view view
21 Miszczyszyn, Konstantin Czaszyn 28 1876-1877 1905 view view view
22 Miszczyszyn, Mikolay Czaszyn 17 1887-1888 1905 view view view
23 Myszczyozyn, Paraska Czaszyn 21 1881-1882 1903 view view view
24 Plaksa, Mikolaj Czaszyn 19 1885-1886 1905 view view view
25 Rejntn, Nikolaus Czaszyn 24 1880-1881 1905 view view view
26 Salak, Marya Czaszyn 27 1875-1876 1903 view view view
27 Salak, Nykola Czaszyn 26 1876-1877 1903 view view view
28 Saranczak, Mihalay Czaszyn 24 1880-1881 1905 view view view
29 Twamsko, Marya Czaszyn 19 1883-1884 1903 view view view
30 Wylota, Helena Czaszyn 16 1888-1889 1905 view view view
31 Wylota, Melania Czaszyn 14 1888-1889 1903 view view view
32 Wylota, Nykolaj Czaszyn 19 1883-1884 1903 view view view
33 Wylota, Stefan Czaszyn 18 1884-1885 1903 view view view
Let me know if this helps.