Misappropriation with ネコババ
ネコババ means to sneak in something you picked up and keep it for yourself, or to hide something bad you have done.
It is often used when one finds a dropped item and keeps it for themselves, rather than turning it in to the police or a lost-and-found center on the premises.
ネコババ is a noun. When used as a verb, it becomes ネコババする.
Further reading
ネコババ|俗語 (edewakaru.com)
Examples
怪盗セイント・テール » Volume 7 » Page 34