Cannot find hough all lines in this simple image

Hi, I´m trying to identify the lines present in the figure to figure it out after if it is a rectangle or not. I´m struggling, could you help me? I´m finding three, is missing one and the other didnt fit the whole side.

[H, theta, rho] = hough(g_edge1,'RhoResolution',0.5,'ThetaResolution',0.5);

peaks = houghpeaks(H, 10);

% Use Matlab's Hough lines

lines = houghlines(g_edge1, theta, rho, peaks);

figure, imshow(g_edge1);

for k = 1:length(lines)

xy = [lines(k).point1; lines(k).point2];

line(xy(:,1),xy(:,2),'LineWidth',1,'Color','g');

end