I hate to be the one to tell you this but, the posters you have are not authentic posters. Here is a link to a site about these fakes you can look at this for yourself if you like. I am only letting you know this because I do not want you to spend a lot of money getting this authenticated to find it is not real. Companies charge quite a bit to authenticate things like this:
These have sold for $300 - $600 on today's market - even through known auction houses. This is mainly because buyer's thought they were purchasing an original wanted poster. Here are links for you to some that have sold in the past and their prices:
Please take a moment to leave a rating by clicking the stars. If you require further assistance, no worries, the question thread does not close even after leaving a rating.