Pilferdick 

Verb: To pilfer through the belongings of someone else and steal for personal gain.

Can I watch your security footage? I think someone came to pilferdick through our shit.

Pilferdick by Doomslinger June 4, 2020

Pilferfuck 

A person you might consider a friend, yet they go through your belongings and steal from you in small quantities so that it isn't easy to detect.

Savy's car is always loaded down with junk, because he's a pilferfuck. pilfer fuck thief

Pilferfuck by Savvy Shelley March 18, 2017