ask at parish-office Biberwier if they have them in their files: http://www.dioezese-innsbruck.at/index.php?portal=100263&...
before 1831 you have to search in Lermoos. Biberwier belonged to it and became an own parish in 1831: http://www.dioezese-innsbruck.at/index.php?portal=7724&i...

Matriken/ churchbooks since:
Biberwier ab/since 1831 (Tb/baptisms), 1864 (Trb./marriages, Stb/deaths) (vorher/before Pfarre/parish Lermoos)
Lermoos ab/since 1636 (Tb, Trb/baptisms, marriages), 1640 (Stb/deaths)

also you can ask at tyrolean country-archive in Innsbruck where the church-books are microfilmed: http://www.tirol.gv.at/themen/kultur/landesarchiv/