I have the following four from Collector's Guild and was wondering what the value might be if any, they are:

Edouard Manet (1832-1883) On the back of the picture is his biography and it also states that this original etching, signed in the plate, created in the 1860's is a superb example of his universal talent and his inventive capacity. Societe de Verification de la Nouvelle Gravure Internationale of New York and Paris certifies and warrants that this is an original etching by Edouard Manet. The Societe de Verification de la Nouvelle Gravure has been created byt the Collectors's Guild Ltd. to set and uphold the highest standars for original graphic art.

Pierre Auguste Renoir his biography and certifies and warrants that this is an original etching by Pierre August Renoir.

La Pose Du Modele by Pablo Picasso - Authentication Societe de Verification de la Nouvell Gravure, Internationale of New York and Paris certifies and warrants that this is an original woodcut by Pablo Picasso. It looks as though its signed and dated 1925

The Search by Alberto Giacometti - an etching stating the same Authentication.
My dad had them for over 40 yrs. I was just wondering if they are worth anything.
Thank you for any information you can provide.