The cost of paintings N. Gushchina

[Levv]

There are two paintings of Nicholas Guschina. The artist has lived long in France, like it has earned a name for himself after the Second World War had the imprudence to return to the USSR, had landed in Saratov. Pictures are not signed, but their membership is not in doubt (at least among museum staff, it seems they have even been exhibited at an exhibition in the museum Radischevskaya). Were donated by Goushchin.
The first picture - 85h61, 5 seems paper, charcoal and chalk, the second - 57h47 5, oil on canvas. Both 50's or early. 60-x.
I searched the Internet mention of sales. I found that once in France in the late 80's sold two of his belongings at auction but prices were not there (or rather, it is open only to subscribers of the database).
How can there be now the price of these paintings?

PS I apologize for the quality of the photo, but I do not know how to handle a camera