My t has invited me to leave things in her office (when she used to have one...) or take something of hers with me, if it would help me feel more connected with her. Occassionally i would see other clients things in tucked away places too, like a stuffie under the chair. My younger alters would leave their dolls for t to "take care of", or t would give them a bear of hers to take care of.
When my t went overseas a couple years ago for her emergency thing, we bought a pittle stuffed animal on a key chain, and she put it on a clip inside her purse and took it with her show she would keep that connectio with us, as well as a small version of one of our favorite childrens books. They are both still in her purse