Pixar shareholder posters?

Hi I have two of these big Toy Story 2 Pixar posters. We got them years ago for being a pixar shareholder, there is one of woody and buzz and one of jessie. We were planning on just keeping them but decided to look them up just to see what there going for and if there rare. There was none on ebay but when i googled them i saw them on an appraisal site but couldn't see what they went for. Do you know how pixar picked who got them and how much they are worth? Thanks any help would be great!!