Kirill, the first one has all the marks of a late 1800s Meiji okimono, the central nerve channel being used to pay lip-service to netsuke. Good work, the artist was possibly a netsuke carver first before the end of the Bakumatsu and changes in fashions.
The second one (stork?) is hard to make out; if it is not resin it could well be a legit boxwood netsuke.
The third one, bamboo shoot and toads(?) gives indications of later Chinese work, the signature written typically in a ‘casual’ manner to suggest Japanese, but not.