I have not found any sources for where he was born or where he was buried. An assumption would be Varnhem. Later generations of Bjällbo are of course linked to Varnhem.
(Interesting reading about the 2007 research, but no mentioning of Bengt Folkesson Snivel:
Varnhem 2007
https://www.varnhemshistoria.se/varnhems-byar,-g%C3%A5rdar,-platser...
Kata Gård
https://sv.wikipedia.org/wiki/Kata_g%C3%A5rd
https://sv.wikipedia.org/wiki/Kristina_Bj%C3%B6rnsdotter
https://sv.wikipedia.org/wiki/Fru_Sigrid
http://wadbring.com/historia/sidor/varn.htm
https://www.svd.se/oklart-exakt-var-kungligheterna-ar-begravda
https://app.raa.se/open/fornsok/lamning/567d69eb-14b4-41da-8309-611...
https://sv.wikipedia.org/wiki/Varnhems_klosterkyrka
)