Man pages matching name sane-mustek_usb2 in section 5:

sane-mustek_usb2.5.en	debian 10 / libsane-common
sane-mustek_usb2.5.en	debian 11 / libsane-common
sane-mustek_usb2.5.de	debian 11 / manpages-de
sane-mustek_usb2.5.en	debian 12 / libsane-common
sane-mustek_usb2.5.de	debian 12 / manpages-de