Thanks.

The website says this;
Incoming mail may include: paper with words/drawings; signed unmusical, commercial greeting cards and postcards; photographs (Polaroid photos must have the backing removed); periodicals and published materials shipped from the publisher; and clippings or photocopies of published materials that meet criteria.

I have talked about this with my pp and he said something about a form he has to fill out to get anything. But I never get full answers from him. He just doesn't want me to spend money on him. And I like to surprise him with something. Even if it's just a magazine. Just something to brighten his day. So I thought I'd check out myself what's possible and what's not, but this seems to be a bit harder than I thought.